Promotional Items (US)
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This will be structured as a list in a general chronological order, but it won't be perfect as many dates are unclear or muddled. Some may not have images. Some may only have contemporary sources corroborating their existence but no known surviving examples. Some will not require much elaboration as they are either incredibly self-explanatory or are shrouded in mystery.
Some items included in this list already have dedicated articles in the archive, sometimes several. A summary will be provided and a link with more information for those keen will also be given. Those links will also be where the information shown here is sourced from.
702 Special Introductory Set
In short, this set is exactly what its name implies—it's an introductory set intended to introduce LEGO to an unfamiliar party. It uses the 702's box to create the 702 Special Introductory Set:

It was used by retailers and in magazines through 1963-64 and was available at a reduced price. Its promotional use continued into 1965 with the introduction of the 93-Piece Set.
1963-64 Salesman Samples
While originally I gave a 1961-65 date for this, now that I've seen images of them, they are from 1963-64:
The key detail is that the sample cites the "Educational Division" of Samsonite, which was associated with LEGO in early 1963 through 1964 with the first institutional LEGO sets. If I had to guess, these were freebies distributed at the education conferences Samsonite attended, such as ASBO (which they attended both years).
The name "Salesman Samples" is a little misleading, as at least this specific example was not for retailers but instead selling to institutions specifically. This is something I've noticed with a lot of promotional materials in general, in which they are simplified into salesman materials for door-to-door sales or whathaveyou.
Sure Cure for Executive Tensions
Supposedly a package of three (likely 2x4) bricks intended as a cigarette substitute.

Scottie Bag (Toy Fair Promotional)
A promotional bag containing four 1x2 bricks, one 2x4 brick, and one 2x2 brick all in red along with a folded card reading "My name is Scottie" and mentioning a Samsonite booth. It appears to have been prepared specifically for an event at some point in or after 1965 (as that is when "A quality product of the Samsonite Corporation" began to be used in advertising/set packaging). It is most likely from a toy fair, though there are plenty of other promotional events Samsonite could've had a LEGO booth, and it very well could've been for multiple.
93-piece Set
This set has several variants. It was used from 1965-1968 as a promotional set through at least two distribution paths. The one below may or may not be from the 1968 Parade Promotion:

But there existed at least a ~1966 Procter and Gamble mail-in offer that has no identified ordering source just yet:
Presumably all versions included B-2187, which was prepared in 1965.
I've written a dedicated article on this promotion: 93-Piece Set. Similarly, I suspect P&G was also the promotional distributor of the 005 Discovery Set's unique pamphlets, being included inside product boxes. These promotions are normally only able to be tracked if they had advertising presence, as in the example below.
1966-67 Oxydol Promotion
Another P&G promotion, there are three versions of the Oxydol promotion, one in late 1966 and two in late 1967 (likely depending on what region you were from). Below is the 1967 promotion limited to Kentucky, Indiana, Tennessee, and Alabama:

These "sampler sets" came with 25 basic LEGO bricks and a pamphlet in a sealed bag within Oxydol detergent.
I've written extensively on this promotion in particular: 1966 & 1967 Oxydol Sampler Sets.
1966-68 Salesman Sample
While I've no source to confirm this was intended to be a salesman sample (as it could've been for other promotions), it was listed as such when it sold online. From the included idea book, this particular one is from 1967-68 as it does not show ages or prices:

110 Chevron Station
This set was sold at participating Chevron and Standard Oil stations in southern Idaho and Northern Utah. It's possible there was a slightly wider distribution range, but that is what adverts reflect.
The set was built off the 093 93-piece Set, with enough extra parts to build a Chevron model. What I'm curious of is why exactly this promotion took place, and why it was so limited. From the adverts, there was hardly any focus on the unique Chevron promotion itself and instead on buying as many as possible:

I've made a dedicated article here: 110 Chevron Station.
Kraft Promotions
There several versions/variants, but the most common Kraft set was the 74-piece set:

It could be ordered via the back of a Velveeta box:
I've made several dedicated articles for the Kraft promotions: Kraft Promotion Dates (1968-1972)
Del Monte Promotion
I've not yet gathered enough information about the Del Monte promotion to have prepared an article.
Life Cereal Promotion

I plan to make an article about this offer as well.
1973 Scottie Keychain
From Samsonite of Canada, an offer for a LEGO catalog along with a Scottie keychain.
