Apart from Mybeerandwine does any one else stock ball-lock disconnects AND the JG 3/8 adapters?
Try the homebar co. In Galway, thy usually have jg fittings, to b honest they are a pita I have 2 on beer gun and they have either broken or siezed
Norm on ebay sells both. He doesn't list everything he stocks on ebay so you usually have to email him for pricing and availability but he's really reliable and cheap.