Cheap Singlespeed steel F+F and a heap of fun: RedLine Monocog
Brand new, project was rendered obsolete when I found my IF 26" SS.
Frame will handle your choice of V-brakes or disc brakes.
If you want larger image edit the "/medium" bit out of the uRL.
I will send this to the UK for 125 GBP posted.
I've got a Silver GT Rebound frame you can have for a tenner plus postage. Bit rough, but seems straight enough. Came with a set of RST forks which seem to bounce well enough, but have no brace. I'll throw those in if they're any use to you.