Found these searching Amazon for "3 compartment food containers":
With that said, don't knock takeout-looking containers- as long as they're not super-flimsy, you can still often reuse them even if they say they can't be reused. My first meal prep containers were essentially a white version of these saved from the local sushi place, and those things went in the dishwasher, microwave, and freezer week in and week out for over four years. I wouldn't trust them with soup, but I never had any leakage issues and all of the lids still sealed normally by the end.
I used ten of a white version of these containers when I was just starting out- albeit cribbed from takeout at the local sushi place -and they went in and out of the microwave, dishwasher, and freezer on the regular for over four years with no significant issues impeding usability. The most that happened structure-wise is that the rims of a couple of the containers and the very centers of a couple lids developed a crack or two, but the lids still stayed on without a problem.
I switched to Pyrex once I got the money and moved out of my parents' house because the white plastic stained easily and plastic in general gets oily and greasy.