Hi guys, fun thread.
Thought I might be able to contribute to the discussion as I am currently working on three different fixie builds.

The first is a kilo tt frame I am building up for the ball and chain as a replacement for her regular commuter which is in need of some attention. Paid a hundred bucks for the frame and fork, brand new with cheesey stock headset installed. NOS iro cranks were seventy five dollars. FSA Gimondi bottom bracket was twenty. New Oury grips were fifteen dollars.

Stem, handlebars, brakes and brake levers, as well as pedals came out of the parts bin.
The wheelset is an Alex r500 pulled off of a Windsor Clockwork I paid 189 or 169 bucks for some years back. It seemed a good deal for the price, so I thought, “why not?”
I now can tell you why not but that’d be a whole ‘nother thread lol.

Might need to buy new housing and cables. But think that’s it so far. Will update as I go, though.