Dice are pretty cheap. If you intent to be a gamer, you should buy:
- A cube of d6's (36 little ones is a good number) -- $5 - $10
- A cube of odd-ball dice (d4, d8, 2d10, d12, d20) -- $5 - $10
T&T uses only d6's (as I said, simplicity), D&D uses everything. If you want to play D&D, you should get more odd-ball dice.
If you want T&T, you can get the rules:
http://www.javaop.com/~ron/RPGs/TnT -- you only need the main
.pdf, everything is included in that.