Currently going through AbeBooks, a whole lot of editions carrying early Lovecraft material, such as the Tryout, National Amateur, Wolverine etc.

Sample titles:

* The National Amateur, May 1926, with “Polaris” by H. P. Lovecraft.
* The Vagrant, July 1918, with “The Poe-et’s Nightmare: A Fable” by H. P. Lovecraft.
* The National Amateur, January 1922, with “The Street” by H. P. Lovecraft.

Also items such as In Memoriam Howard Philips Lovecraft. Recollections, Appreciations, Estimates by Paul Cook, The Driftwood Press, Vermont, 1941.

All at ‘rich collector prices’, unfortunately, but some may be interested.