I know there is a lot of interest here wondering how to go about it.
I bought a vacuum pump off of ebay for $70. The same model was listed by others for around $200 but the guy I bought it from had the auction set to end at 4 in the morning and no one else bid on it!
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Single Stage (500 Microns)
◍For A/C And Refrigeration Evacuation
◍All Metal Construction
◍Dual Voltage 1/4 Motor
◍Male Flare Intake Parts: 1/4 x 3/8" SAE And 1/2" ACME
◍Blank Off Insulation Valve
◍6' Power Cord