We've been filling tires off our scuba tank for decades (really!) it doesn't look as clean as the pre-made setup, but has a couple advantages. all you need is a tank, a 1'st stage regulator, and attachments of your choosing. The 1'st stage should have 4 (+or-) air outlets on it. one will be used for your air pressure indicator. Since this will be sold to you over the counter attached to rubber tubing there is less worry of something snapping it off at the valve. you can then attach air hoses to however many of the spare air ports out of the regulator that you want. The main advantage (other than cheap fillups) is unlike the pre-made system, you can change out the tanks to fit any size scuba tank you want. AND, you can twist one screw and move your stuff from tank to tank. carry a spare, use a smaller tank for lighter trips, etc. (remember, you dont need the regulator 2nd stage (mouth piece) just the first stage that couples to the tank. these can be purchased seperately.) and dont be afraid to go cheap. most of the expensive regulators have added costs associated with corosion resistance, dry-bleed internals to keep water out, and other useless scuba malarki.
edit: and scuba tanks come in every color! match to your vehicle!
edit: edit: the 1's stage regulators have high and low pressure ports. check to make sure you have the right ports for the tools you want to use. you will want at least 2 high and 1 low.
edit: edit: edit: just looked on ebay and you should be able to put together a whole rig for under 250. under 300 if you use all new parts. and under 200 if you are good at finding the super deals.
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