There are tons of characters that can be made via "closet cosplay" or cheap supplies from Goodwill, FISH ech. Many only require simple clothing items which may be easier to find in places like this such as most characters from South Park, L, Quote ect.
Also many cheap simple props and armor can be made out of craft foam and resin which is inexpensive and easy to use. This opens up your options even more!
It is recommended to save up for a sewing maching and then your options are endless and making your own costumes is much more rewarding since you can customize more than buying a cheap item!
Raging Brachydios Armor
Smash Bros. 4 Captain Falcon