air compressor

[Ryuji Suzuki <rs@silvergrain.org>]

I think most people here do the same kind of things, but I use
a lot of canned air to blowing dusts on scanners, enlargers,
negatives, camera under repair, etc. and wondering if there's
a simple and inexpensive alternative. What's the smallest and
cheapest air compressor that can be used for this type of
applications?