I've assumed a airbrush kit was requested.
This is about as suitable as it gets for 'cheap'. It does the job while you learn and it's what I used.
http://www.ebay.co.uk/itm/Airbrush-C...tRyHAIy9DYB0YQ
However if you end up using it regularly then the quality will degrade quicker than something of more recognised quality like an IWATA eclipse CS (as mentioned) and Bambi compressor for a loose example.