Rare books
Pressmark
Which edition to look for, what it should cost, and who to buy it from. Guides to authors and books, a register of the dealers and fairs of the trade, and a library for your own collection.
pressmark.co
Vintage video games
Hangtabd
Physical video game collecting. Every console, every era, every region. Sealed, complete and loose copies tracked and priced separately.
hangtabd.com