Your local frame shop is going to do a better job than anyone else. There's a reason this craft has endured: It's skilled work that is best done in face-to-face physical space. Online framers are not cheaper, nor are big-box framers...don't be fooled. Be sure to ask for a dry mount, as wet mount can buckle matte paper. The framer should know this. 
Our friends at The American Design Club sell frames suited to our prints.
See those here.

We also work closely with the following frame shops, and they will do a wonderful job:

Foursided, Chicago, IL
Mel's Frame Shop, Portland, OR