Recently I selected two of my Holga shots to sell as prints on Imagekind.com.
There are a wide range of print options available including paper choice & frame type.
To test the quality I got these two photos printed on "premium photo glossy" paper and framed in a wide square black frame. The prints were 11" x 11" and the frames were about 18" square. I was very impressed with the quality and both prints are now hanging in the hallway of my house.
Check out my gallery and come back often as I will be adding more photographs over time.