I'll second Burra's post, a "loveable loo" really isn't too hard to build.
It's basically just box with a hinged lid, a standard toilet seat attached to the lid, and a 5 gallon
bucket inside the box. You may be able to have the
wood cut to size at the store, and just assemble it at home.
You can also buy a snap-on toilet seat from an emergency supply store. These are a bit smallish, but do work.
You might be able to find someone to build one for you, too.
Good luck!