I looked at realtor.com a while back out of boredom, seems like a good site to find a place and it even has a payment calculator. However, the amount that you are willing to spend isn't going to get you much of anything. Low price houses don't seem to exist even in the towns that are a little ways out. If you are considering a mobile home (usually called "modular homes" now) then you would be best off going new. The quality of them has been really going up, to the point where even a 5 - 10 year old one can't compare to a new one. You may even be able to get better financing, but that's only a guess.
As for where to put it, if it were me I would MUCH rather have my own land to put it on, but for your budget thats just not going to happen. Land is too expensive around here. I know nothing about the prices of lots.