i have know idea what prices would be to paint 1 case..
.. i buy everything in bulk..
.. just phone your local auto/boat paint shop
and ask them how much for:
1x 1/4quart of aluminum oxide primer WITH catalyst
1x 1/2quart of 2part epoxy primer
1x 1/2quart of black paint
1x 1/4quart of clear coat
1x 1/2quart of laquer thinner
and i recommend getting the old finish off first.. so you'll need some 120gt paper and some 400gt and 800gt emery paper too
as for any tips.. yeah.. use a spray gun for the smoothest finish..
... i suppose you could get it powder coated ..
that'd be cool.. might be cheaper too... as long as you dont want metallic finish
.. if you did want a metallic finish.. a first coat of silver flake would make that black sparkle !!
.. now then
... if you do get all that old finish off, and you kinda like the bare aluminum colour.. just get some 1000gt paper or sanding pads and brush it all in ONE direction or in even swirls for the best brushed aluminum look.. then ETCH any designs you want in it.. (Tattoo galleries give good stencil designs) .. and varnish the whole thing to protect it from scratches.. you can get good aluminum varnish from auto shops aswell