Ive had mine for about 4 month now and love it to bits but they are making very poor money on ebay,there is next to no goodies to find for them,and a search on the internet for like minded owners sites etc is like hissing in the wind! What a great little bike,loads and loads of very cheap fun but as popular as a nasty smell in a lift,until i sell mine then the whole world will latch on this soon to be much saught after classic pocket rocket.
There are loads of goodies for them. As the others said, you have not been looking hard enough.
They seem to be going through a bit of a mini revival in terms of peoples interest in them, probably because you can pick them up very cheap and they are great fun.
Air-cooled two valvers are the best things they make. I've always had 4 valvers but, tbh for road use the 2v motors are all you need. I love 'em - lots of grunt right where you need it and no need to chase revs. My 800ss will stay with most things on a twisty road without having to break into a sweat and there's loads of decent performance bits out there for them. I'm a convert.