First, welcome to the club! There are quite a few members in the Houston area.
For a trans rebuild, the usual route is just to exchange yours for a rebuilt one for about $500 (stock). Kermit at Kar Parts can fix you up:
http://www.karparts.net/
Another option is to get a used one for $150 or so, but obviously there is some risk there.
The motor is a little more complicated because there are so many options. Rebuilding it yourself is the cheapest and isn't difficult at all. You can have someone rebuild it such as Henry at Bugoholics:
http://www.bugoholics.com/
Or you can buy a build motor usually upsizing in the process.
Hope you can make it to the Buggy RoundUp Labor Day weekend - with or without your buggy.