Looking to Buy a Portable Chest Freezer

I need something capable of holding several 13" x 9" casserole dishes, and keeping them frozen for about a week. 115VAC will be available. I don't want to pay $500 for a high-end camping freezer, either. I installed a 2.5cu ft (dorm-room) fridge in my popup, and would be happy with a freezer of similar size and cost.

Any ideas?

Thank you.