I buy my filters from
ebay and I buy either Hoya or B+W. Most of the time they are used and I've never gotten burned (knock on wood).
Great go-to brands.
I have Tiffen brand CPLs, they are fine, but when I hold them up against this screen they can change the color hue based on the rotation.
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they can have a HUGE affect on skies, so a good rule-of-thumb is to take multi-shots using them with different rotations:
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you can see the green hue being cast here too.
problem with these are, look how much is also affects my subject, since they are reflecting white -- CPLs are great for reflection control. So if you're using them for portraits, expect to lose some of the 3Dness of your model as it will reduce the highlights on foreheads/cheeks which give shape to the face.