you could probably find an old shimano front disk hub (110mm spacing) real cheap and convert it to solid axle with an extra 10mm of spacers for a cheap fixed only hub.

i found an old deore hub on ebay for 10 bucks and then spent about 10 bucks for the parts to switch out the axle and the needed spacers. chainline seems like it would be perfect but honestly i never got around to buying a cog or building it into a wheel. someday soon when i need a new wheel i'll give it a go...