Bravo for having a crack at wheelbuilding yourself. It's tricky, but immensely satisfying.
If you want some rims, I have some black disc specific DT Swiss rims for sale, the ad is in the 98> for sale section.
However, it is possible to get a set of wheels for not much money. I bought some Mavics last week on here, for less than the cost of my proposed build with the DT rims I no longer need.
If you're after a set of do anything, good strong wheels though, I may have just the thing. I just removed a compete wheelset from my 2000 ish Schwinn 4 Banger. They're ludicrously strong, very reliable, reasonably light, easy to service (just push some new readily available sealed bearings in and they are instantly as new), and are a mix of black and chrome. They're in very good nick, and are disc or rim brake compatible. They aren't from a 'label' maker though, but what they lack in pedigree they make up for in price. They would fall well inside your budget.
Pictures here, in the 'what's is worth' thread;viewtopic.php?f=41&t=140396&=1997810#p1997810