Haven't check myself, but you might try your local technical school or university bookstore for student versions. There is a student version of the Microsoft Office products which is much less than the version for the public, and I am told it does much the same.
I've suggested IMSI's TurboCad, which is a very user friendly program. About $80. Will open & save in AutoCad formats (I have had some problems with x-refs, though). It comes with an entire disc of symbols. It only lacks a couple of features of the full blast AutoCad (like "fence").
GJ, I've never used their customer support system. The only compatability problems I've encountered were once with the x-refs on someone else's plans, sent to me via e-mail, and as a compressed file. If you are going to be generating all the drawings yourself, this shouldn't be an issue. Maybe others have had problems that I haven't with compatability.