Nail Creations have gone bust and been bought by other companies more times than I have had hot dinners!!! I would sit tight and see if anyone buys them again and continues trading. Alternatively I have already discovered that SUDO do many parts that are compatible with my airbush that I also bought from Nail Creations. A compressor is relatively universal you will just need to invest possibly in a new gun and nozzle etc. I also found that sudo paints are far superior!!! as are their stencils, tanning products, customer service and well everything.
Don't worry if you can't get a refund (which I very much doubt because if they have gone bust they have got no money to give you!) all is not lost... there are lots of airbrush companies out there that can help you without reinvesting a huge amount of money!!!
