If you don't have your own framer in mind, Amazon might be a good option. They stock a huge variety of frames, in a range of colours and styles, with or without mounts, and are quite reasonably priced. I've added a few examples below. Please click on the images to view specific products. And please be sure to get the right size frame. My portrait sizes refer to the size of the paper, e.g. an A3 portrait is on A3 paper, and there will be a bit of white space around the edge, which goes under the mount.

The frames below are UK only. Here are the links for American and Canadian visitors:     US Frames     Canadian Frames