Most of the cheapies now have functions guided by computer chips, so the old simple-minded boxes have disappeared from stores here.
I have one in the kitchen, chrome-plated to look fancy, that has lots of functions, and cost $98 Canadian. I have another upstairs to warm things up (Who wants to go downstairs to the kitchen in the middle of a good DVD?) which cost $49 Canadian at a box store. I just looked at it closely and guess what? It has nearly all of the functions of the more expensive model.
Oh yes, the one upstairs is accompanied by a $79 fridge.

Incidentally, it doesn't help much to look at the consumer guides. The works for many brands come out of the same Asian factories and are housed in cases made in the same or other Chinese-Indonesian-Korean-Philipine etc. plants. Only the labels and cosmetics differ.