I've found the Walmart ones are less than $15 (Slime or Campbell Hausfeld), remove the guts, and about the same dimensions and look as the Aerostich. They also call them "inflators" I believe instead of "compressors". I've used a CH 7 or 8 times over the years and still running strong. I find the CO2 bulky and expensive for the limited amount of air they provide.<edit in> 4"H x 3.5"W x 2"D Found them on fleabay for $39.99 shipped. Good deal?
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