You might consider IntelliCAD, which is essentially a clone of AutoCAD. There are differences, especially for those who use the mouse instead of the keyboard for commands. But, it really is a very good substitute for Autocad at about $200 and they have a downloadable trial version as well.
There are several sources who sell it under their own name.
Also, if you are interested in Solidworks, they have a very nice 90 day learning edition and you can renvew the trial version when it expires. The only limitation is that it always prints "learning edition" and the drawings created with the learning edition can't be used in the regular version.