Restaurant supply stores are a great place to get kitchenware. Some of it doesn’t work in a home kitchen (for instance, you probably don’t want your smallest Tupperware to be a quart). Some of it, though, is perfect. My favorite purchase has been a huge cutting board with rubber grip material on one side and rulers printed on the other. It’s thick plastic so it’s never warped despite repeatedly putting it in the dishwasher.
If you’re lucky enough to live near one that lets consumers buy food, too, that’s great. 20 pounds of very high quality pasta for like $8 or $10.
stainless steel serving pans and steam table trays are great roasting pans; abusable, scrub clean easily, stackable, etc. "consumers" get enameled oval pans that served our grandmothers as poorly as they do now.
Also caught some lovely cheap "disposable" paring knives that have served in our kitchen for several years and still going strong.
If you’re lucky enough to live near one that lets consumers buy food, too, that’s great. 20 pounds of very high quality pasta for like $8 or $10.