I bought my cabin filter at the dealer.
The cabin filter is located behind the glove box. Open the glove box - the back of the glove box is a removable panel; there are two latches on the top edge of the back of the glove box; pull them toward you and the panel comes with.
the air box where the cabin filter resides is exposed when the glove box rear panel is removed. There is a plastic latch on the left side of the air box that, when pressed, will release the access panel (again - pull it toward you) to the cabin filter. The filter just pulls out.
Piece of cake.