If you're open to cooking things, that'll be a lot more budget friendly. Search the sub. With an air fryer and microwave, you have lots of options. Corn tortillas and masa harina also let meals come together quickly (tacos or pupusas).
For quick noodle stuff,
https://www.amazon.com/Thai-Kitchen-Gluten-Free-Noodle/dp/B003VYF3TK
https://www.target.com/p/annie-39-s-organic-gluten-free-vegan-pasta-6oz/-/A-82244069#lnk=sametab
Aldi ("live g free" house brand) and Target have pretty good GF options, so look around sometime and pick out products to try!
There are also lots of pre-cooked pre-seasoned rice and bean packs out there. Check that they're gf but that is a shelf-stable option.