Craigslist is usually a pretty good place depending on where you live, just make sure you see the stuff before you buy. This is a good time of year since most new years dissolutions are being sold off.
I bought a standard power rack by bodysolid for 275 from jesupgym. It was the cheapest by 100 bucks. will last forever.
i bought a pretty good commercial bench for 40 off of craigslist. Could be used in a comercial gym but its not designed all that great(the decline declines too much), although is very sturdy, looks good, and will last forever.
weights were free(found em) although they are standard weights and not olympic weights
Also, try to get dumbell holders that use whatever size plates you will purchase. You only need one set and they can accomadate the olympic plates. Adjustable dumbells will eliminate any need for regular dumbells