Not sure what Generation Prius you own, and if there is an oversize filter available...
But my choice would be the same, a Purolator PureOne (yellow color)...
Either from Advanced Auto when you can get the 40-50% off coupon, or Blains Farm and Fleet, Free Shipping with $75.
Blains also has the Purolator Synthetic (blue color).
Not the best filter, not the cheapest, but the best bang for the buck filter... [/quot
Its a gen 2 2005 with 132,000 miles. I have a walmart purolator classic on right now. It's only had Toyota filters from the dealer before that.