Are you in the USA ? If you're in the US and don't need rpms in a low power 80 mm, go with panaflo (which can be had for under $5 each fan) but know you will either need to feel comfortable with soldering, crimping, or otherwise adding your own 3 pin or 4 pin connector -or- you'll need to trim the included two pin connector to connect to a male 3 pin connector plug (like your motherboard plug) -or- you'll need to buy a special 3 pin tail from somewhere (they're made for people who don't like soldering things...).
If you're in the UK, get papst (not PBR ), they're supposed to be cheap over there, while we pay over $10 (closer to $14) for them in the USA.
BTW: My most recent order for a 5 pk of 80 mm panaflo L1As was for $5 each at fozencpu.com.