http://cgi.ebay.co.uk/AIRBRUSH-COMPR...ingSupplies_EH
then give one of the cheaper brushes a go. i wouldnt hold my breath on their quality/longevity but hey, i might be wrong!
http://cgi.ebay.co.uk/Thorite-Diamon...ingSupplies_EH
http://cgi.ebay.co.uk/0-5mm-AIRBRUSH...ingSupplies_EH
http://cgi.ebay.co.uk/Double-Action-...ingSupplies_EH
might get some to try actually. might even be able to tune em up and swap some of the parts for better ones..hmm...