Cheap matting for photos?

Cheap matting for photos?

I'm selling my photography at a craft fair in November, so I'm starting to make my prints and mat them now. Does anyone know where to get cheap matting for photos? I know Wal-Mart has them for really cheap, but I refuse to shop there. I tried Michael's, but the ones I'm looking for (the frame part, and the cardboard backing to attach the matting frame and photo to) start at $6.99 each. That's not a huge amount alone, but I'm estimating I'll have about 75 prints to sell, so that will really add up. Does anyone know of a store that may have them for cheaper? I live in Maryland, btw.
before&after: my office

before&after: my office

Splitting a Rosemary Plant?

Splitting a Rosemary Plant?

new room, so much space!

new room, so much space!

Plant ID Please

Plant ID Please

I STINK at identifying trees! :-(

I STINK at identifying trees! :-(

pesky pole, please help!

pesky pole, please help!