Go here and check out the public access Knowledge Shop and look under the General, Web Application Server category. You’ll find both 6.10 and 6.20 releases of the Web AS that will give you a full ABAP enviornment for your enjoyment for about $30 USD. Of course if you are running Linux you can order that version for $0. Quite the deal either way.
These are systems good for installing on your development machine or on a sandbox, they are of course not for productive use etc., etc. The license is temporary but you can extend it regularly here.
Of course the 6.30 Web As that includes the J2EE enviornment is available from the shop for $0 or you can download it here at SDN if you prefer.