On a budget, or just plain economical, first try CL or FB classifieds for takeoffs. Presuming for tires only, you want to stay with smallish tires (since you're currently running the smallest pizza cutters possible), 245 75s or 265 70s are what you're after.
Or for the same or less $ than new tires, new takeoffs on the rim in 17, 18 or 20" sizes.
The selection ain't what it used to be, thanks covid and Brandon, but still deals out there and generally pretty good deals as your size is not very popular or in demand in the consumer market (which is what CL and FB will be).
If you're the kind of fella that can't sleep at night knowing you didn't pop your tire's cherry yourself, then I've had great luck with Kumho and Hankook tires on the bargain side of tire pricing.