Record cleaning machine vacuum


I am in the process of building a record cleaning machine and trying to decide what route to go with the vacuum pump. I have looked at several sites and a lot of DIY units use a shop vac. I have been trying to to find a smaller unit like what is used in the VPI machines in order to keep the finished box small. Does anyone have any suggestions on where to look for one? I don't want to pay a lot for one as a 1 gal shop vac at Wal-Mart costs $20.
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i am using the small shop vac, modified crevice tool and old turntable plinth/platter as my rcm. i have less than 50 dollars invested and other than being a little loud, works great. plenty of vacuum for the job
I have fabricated a DIY RCM based on a Monks/Loricraft design which uses a Sears 2 gallon 1.5 peak HP shop vac. It sells for about $25. As with any small shop vac, the thing is ridiculously loud in use. The irony would be too bitter to incur hearing damage due to judicious record cleaning using this thing so always wear earplugs or muffs. The saving grace is that the entire contraption cost under $50.

Don't know what type of vacuum unit is in a VPI. A 16.5 is pretty loud in use also but still nowhere near as bad as a shop vac.