Just put a Fram fresh air one in from Walmart. I have used them before in the past i can't tell much difference in quality from all the ones i see at the auto parts stores.
I purchase my cabin filters online from either Rockauto or Amazon.
I just purchased a FRAM Freshbreeze cabin filter for my 2011 Hyundai Sonata from Rockauto for $7 + $5 shipping. It will be interesting to see if the carbon and baking soda infused filter is noticeably different than the standard cabin filters I have been using over the past 3 years.
The dealer charges $89 to replace the cabin filter, which is only a 5 minute job. Needless to say, I never pay them to change the cabin filter (or the engine filter for that matter!)
I just purchase 4 wix 24882 cabin air filter for $12.36 each with no shipping charges and no sales tax. The wix 24882 fits both my Saturn and Malibu. Amazon rocks!
Yikes... while I was out & about today I meant to pick up a cabin filter, but jumping from one store to another not finding my oil (eventually did), it somehow slipped off the radar. Just not yet used to having a vehicle with a cabin filter I guess. Besides, I think of a cabin as something built up in the boonies.
I got a Driveworks cabin air filter for my Honda and it was like 8$. Drive works makes very good Air Filters and Oil Filters and for the $ you really cant beat them.
I get Mann cabin filers on Amazon. As I have European cars, the Mann cabin filters for European cars are almost always identical to the manufacturer OE filter.