I discovered a bare spot in my microwave,we will have to replace it, if I buy one from Sears will they take the old one

If you buy one from Sears. Lowe's will not take the old one. Lowe's will not take the old one if you buy one from them.

They don't take the old microwaves so you'll have to put it out for garbage

You mean if you buy one from lowes? And no they don't take the old ones

I really have no idea to be sure the best thing to do would be to call them