I've been using Red Bubble for quite a few years now and have always been happy with the quality of their greeting cards and framed prints. A while back they started to offer photographic prints unframed as well, at a reasonable price (from £6.80), so I thought I'd order some samples to see what they were like.... I ordered two seascape prints (the ones below) in a metallic finish and one in the regular lustre finish. They were all beautiful and the metallic ones really *glow* in the light - they work really well in artificial light as well as natural light. I think they work particularly well with seascapes and landscapes - rather magical!
I also ordered a matted print, which you can either pop in a frame, or simply prop up on a shelf. It's a great low cost option (£18.00) and is backed with heavy duty card, so is nice and sturdy and won't come apart. The ones below have an off-white matte, but you can also get bright white or black.
They also offer greeting cards in two sizes. They are currently £2.28 each for the larger size (12.5cm x 19cm) and £1.51 each for the smaller size (10cm x 15cm). There is a discount of 20% if you order 8 of the same size and a discount of 30% if you order 16 of the same size.
You can browse my photos for sale on Red Bubble at www.redbubble.com/people/zoepower/portfolio.