It depends on what it is and what I'm doing.

Cheap (for me)
Gels - Usually from Sally's for ~$2
Certain daily conditioners
Shea butter
Hair pins, clips, head bands, and other styling tools (Sally's, Nordstrom Rack, Ross, etc)

Hair butters/balms
Leave-in conditioners
Brands like K-C, Diva Curl, Mozeke, etc.
Denman brushes though they are pretty reasonable IMO

All in all, ingredients come before price.
APL BSL MBL WL HL TBL | porous, fine/medium strands, medium density
My Fotki!
Below: Typical PS bun