JB is a good brand, last I recall was US made but not cheap. Stay away from Mastercool and Harbor Freight, they are not quality.
Make sure you change the oil regularly.
Vacuum pump oil is hydroscopic and soaks up moisture from the air like a sponge.
Pawn shops can be a bargain also.
Over the summer I picked up a Ritchie 2 stage pump. Sticker price was $50 and it worked well I offered $40 and they accepted.
I felt kinda slimy for a second, but quickly recovered.
Here in Houston every Pawn shop has vacuum pumps , but prices are all over the place!
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