[civilized]

Can you recommend any particular sellers?

My oven stops working with some nonsensical error message when I try to use it above 350F, so I'm in the market for a new one.

[rootusrootus]

Not OP, and not making any recommendations, but even something mainstream like webstaurantstore.com carries a fair amount of commercial cooking equipment. Enough to give you some ideas, at least.

[bluGill]

Odds are there are a few restaurant supply stores around you. Most independent of any chain. They tend to be open the the public only 'working hours'. Find one that wants to serve you