I'm not sure how relatively inexpensive you want but I found these a good buy and use one on my Jun-Air compressor:
http://www.everythingairbrush.com/ac...and_Hoses.html
Make sure you order enough male - female reducers etc or whatever you need for your airbrush too. I'd steer clear of some of the cheaper compressed air accessories which often have such poorly made threads they can be a pain to get air tight unless you want to buy ptfe tape in bulk!