If you're like me (lets just say frugal :-), and don't relish the thought of going the custom frame route for the prints, here are some suggestions...
- Michaels. Hopefully, you have a Michaels arts and crafts store close by. Nowadays, they have quite a large assortment of different 3:2 aspect sized frames. My favorite are frames matted to 12x18 size. They also have some poster sized 20x30" frames as well. If you do a little digging, there's usually a 40% off single item coupon you can use to really knock down the cost of that frame. Of course, they also provide custom framing $ervices if you'd like to go that route.
- Ikea. Yes, the Scandanavian furniture store is a great place to get frames. Especially for the larger sized 12x18 prints. Here's a link to one of their picture frames , which is nicely matted for a 12x16 print and very reasonably priced. There's a bit of cropping off the sides, but it's usually not an issue. I have quite a few of their frames dotted about the house with my pics in them.
- 8x10 vs. 8x12. On some prints, the way the subject fills the picture is such that it does matter if it is cropped down to 8x10 vs. 8x12. (Incidentally, 8x12 and 12x18 preserves the original aspect ratio of 2:3 from the camera. Hence those sizes).
However, for the vast majority of them - it actually looks better cropped to a 8x10. You can either ask me specifically for a 8x10, or just get the 8x12 and fit it to a 8x10 frame. The advantage of getting a 8x12, and fitting it yourself - is that you control how the image is cropped (just by sliding the picture around in the frame openning). If I do it, it's set and there's no room to change it.
Another option is to get a large frame matted to 8x10, and carefully enlarge the cutout to 8x12. Usually involves a straight edge and exacto knife. Only try it if you have steady hands! Most frame shops would also cut you a custom matt, usually for a very nominal charge.
- For a 20"x30" poster sized prints, Michaels or Target are great places to look. Ikea would work too, as they have nice large frames (about 28x40") matted to 19x27" which would be ok for a 20x30" print. The stainless steel framed model cost under $30. Looks really nice with the matting. Alternatively, a frame shop can always mount and frame it. If you stick with a basic frame - the cost is not too bad.
Hope that helps!