I routinely find 2x-4x and plus sized pants at Red Racks, esp the one on Battlefield and Kansas. Prices tend to be 50% off retail prices, and sales can make that another 50% sometimes. Quality is pretty good too.

Came here to say Zenni. Very affordable, make sure you get your pupillary distance measured and noted on your prescription. It helps you see through the middle of the lens better and prevent eyestrain. Personal experience lol.

Prices start around $10 for frames

Only been to Hippos so far and they were pretty affordable, professional, organized, no hassle at all.

Habitat for Humanity's ReStore has some good sort of overstock stuff, some used, some seem to be showroom floor stuff that may be slightly damaged but usable.

Thank you for doing this and making it a teaching moment for your kiddo. Glad there are still good people in this area like yourself.