Enworld = nearly endless ideas incorperated into my homebrew at 0 cost.
- current list: sorcrer, magic item crafting, paladin, rules clarification & purchase choices. I use far more from here than my 60+ Dragon Magazines, or any single 3rd party book.
Core: 1st, 2nd (not including monsterous compindiums), 3rd, 3.5
Used Mage: the Asension 10$
Companion Rules book used 5$ - even after I quit playing (galantri) I used the mass combat, and domnion building rules for all of 2nd ed and the one game of 3.0 that involved such things.
Battlemat, although I only use it when I am actually DMing a game, which is a small percentage of the time I spend on gaming. (compared to time spent in prep, or on enworld)
pencils.
Dice.