You will certainly find a goodchoice of treestands at Cabelas and also Bass Pro-(as well as many other outdoorstores).
http://www.cabelas.com/cabelas/en/common/search/search-results2.jsp?Ne=2510&noImage=0&Ntt=treesta nds&Ntk=Products&QueryText=treestands& Ntx=mode+matchall&N=4575&trueNum=196
Remember when it comes down to money you usually get what you pay for. Like I mentioned in an earlier thread, cutting corners with safety, isn't a good thing.
However, you can still get a pretty good treestand for around $80 US$.
The Big Game Boss XL hang on stand is one I would recommend, as I myself use these stands. The Gorilla stands are also good.
It comes with a safety harness and instructions. They are also other stands that comes with an Instructional DVD.
Check out the web page inserted above--if you have further questions do not hesitate to throw them at us--they're many menbers on this board who will willingly offer you assistance.