I've been shopping chamber vacs for a little while. The Vacmaster 112 was over 700 on Amazon and most other websites. It's under 600 on Webrestaurant but out of stock. I was pleasantly surprised when Amazon dropped price yesterday to just under 600 and then today to 549. They just put one on the brown truck for me. 2 left.
I've no affiliation with either Vacmaster or Amazon, just a cheap SOB that spends to much on toys.