Where are some cost effective places to stay in the Cape Cod Area?

I have vacation coming up in May and I live a couple hours from Cape Cod. I don’t have a lot to spend but I want to bring my gf and stay in a decent hotel for a few nights…I know there are some Boston area people on here…could you give me some ideas or maybe a review of where you stayed? If not, could you recommend a website where I could book a cheap hotel? I hear the rates are super low these days.