Go ahead, buy a cheap tripod. Sooner or later, you'll either go ahead and buy another better one or wish you did. I bought a cheap $15 one from XSCargo. I'm sure it does the job, but as your camera gets more $$$ and your lenses get more $$$, do you really want to trust it with a $15 plastic tripod?
Thom Hogen's thoughts on buying tripods:
http://www.bythom.com/support.htmAs for recommendations, for a DSLR I like the Manfrotto 190 series. They can be had for around $240 with head. They have cheaper ones, but they can't support a lot of weight, so you'd end up buying yet another tripod if you upgraded to better, heavier lenses.