www.sporcle.com <----- that'll keep you busy for a few months.
Aside from Sporcling/gaming (Sims & Big Fish) and snake-ing, I'll list some of my other hobbies for your consideration... not all are "low-budget," but most can be made "affordable" enough.
- Photography
- Road tripping (just go anywhere!)
- Writing
- Playing music on violin/viola, piano & guitar
- Watching classic movies, both at home & a local classics theater
- Hiking/walking (with my dog)
- Yoga
- Swimming & hot-tubbing