I know of a few online retailers that specialise in out-of-print (OOP), second-hand, and original editions of RPG books and accessories. Let's make a definitive list of them!
I'm new to d20. I recently acquired a bunch of D&D books and I'm sure they are all either 3.0 or 3.5, but it doesn't say in the book which version it is. How can I tell which version the book is? ...