Im in no way affiliated with columbia or campmor, but they have a nice selection of columbia polarized sunglasses for $20 (which is pretty unheard of for polarized these days)
http://www.campmor.com/webapp/wcs/st...Id=40000000226
Columbia Tactic 7001Polarized Sunglasses
$19.97 Regular Price: $109.95
Next Lowest: Sierra Trading Post for $59.95
http://www.campmor.com/webapp/wcs/st...Id=40000000226
Columbia Mad River 7040 Polarized Sunglasses
$19.97 Regular Price: $109.95
Next Lowest: Sierra Trading Post for $44.95
http://www.campmor.com/webapp/wcs/st...Id=40000000226
Columbia Jac-Knife Polarized Sunglasses
$19.97 Regular Price: $109.95
Next Lowest: Sierra Trading Post for $59.95 (STP link has a picture, may be a different color)
http://www.campmor.com/webapp/wcs/st...Id=40000000226
Columbia Arctic Point 3023 Polarized Sunglasses
$19.97 Regular Price: $109.95
Next Lowest: Sierra Trading Post for $59.95
http://www.campmor.com/webapp/wcs/st...Id=40000000226
Columbia Miramack 7005 Polarized Sunglasses
$19.97 Regular Price: $109.95
Next Lowest: Sierra Trading Post for $49.95
http://www.campmor.com/webapp/wcs/st...0000226&sort=A

For those young bucks out there, campmor has been in business for years upon years. when you go to your mailbox, there is no question that that little yellow catalog printed on cheap newspaper type paper is from campmor. (seriously, im 27 and my father used to get their catalog.. its never changed)
They have a 9.66/10 lifetime rating on resellerratings.com
http://www.resellerratings.com/store/Campmor
they also have a decent selection of bolle glasses available as well (not many under $50 for polarized though)