I'm in need of quick disconnects for my co2 lines and beer lines, so I went over to mcmaster and spec'd these out. Man did it come out to be pricey.
5012K712 - Acetal Quick-Disconnect Coupling Plug, 1/4" Size, for 5/16" Tube ID, with Valve - $6.45 Each
5012K672 - Acetal Quick-Disconnect...