If you want to own the A-Z of pulps, this is where you need to begin. Or stop
223953377909,https://www.ebay.com/itm/Tip-Top-Semi-Monthly-1915-August-10-Pulp/223953377909?hash=item3424a95a75:g:50gAAOSwvLtedn64,Rare early dime novel title continuation in pulp format :-)". Click photo for details/to buy.
Rare/interesting pulps for sale anywhere, usually eBay. Occasionally stuff from my personal collection.