good deals on phones with 1 or 1.x gig cpu etc ?

Hey guys, can some of you tell me where/if i may able to find a good deal on a phone with a 1 or 1x gig processor or thereabouts?

I'm looking for something on craigslist or ebay that I can use on a t-mobile prepaid plan, I figure i could find something used for around 75 bucks? There's so many phones for sale on ebay and im not up on the various models so i have to keep looking them up - i figured i could ask here