I've got a Beta Rev 3 270 that I'll sell for R12k. It needs new plastics, fork seals and some welding to the silencer bracket (I've put on a temporary home made bracket). It still works and runs fine. I can email you some if you are interested.
Understand though, that it's not mint, and will be a bit of a project...
I had a closer look at the old Beta last night, and I'm afraid it needs too much work done for me to sell it as is. It will bother my conscience. It's developed oil leaks all over the show, the rear brake master cylinder has seized plus it needs new tyres (perished), new fork seals and new plastics. Plus lots of other niggles.
I'm going to rather fix it up over the next few months then reconsider... Sorry for wasting time & getting hopes up.