Personally I just use the sand I dig out of my back yard. I make sure it is dry, and sift it through some window screen. I prefill a couple garbage cans so I can make it through winter. The stuff works like a charm, costs nothing, and when it gets too fine it just gets sucked out of the vent.
For venting your cabinet, I would reccomend the princess auto dust collector. Toss out the filter bag mind you, and just shoot whatever it collects outside. They run about $120 and will keep the inside of your cabinet in a negative pressure state. This also prevents the dusts from sandblasting from escaping through the cracks in the cabinet. Duct tape also works well towards this....but put the tape on the outside of the cabinet. Inside will not be around too long.
I find that the gun will clog with various debris from the sandblasting. Things like chunks of rust etc. I plan to put another screen lower in the hopper to prevent the debris from getting to the pickup tube. While you can put your hand over the nozzle for a second and clear the debris, it just keeps coming back.
Also, be prepared to replace those gloves pretty quick. They tend to tear open fairly early in their life. The replacement gloves at princess are just fine.
Lastly, you may find small jolts of static jumping from your chest to the machine. It hurts like a bugger after a while. We get it here in the winter when it is especially dry, but it occurs on any dry day. For that I run a small wire to a sports wristband. The wire is attached to a snap which touches my arm. The other end of the cord is attached to the cabinet. Kind of evens out the electrostatic states.
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