Other price comparisons to consider:
10 pieces 100mm x 100mm is $24.90 from iteadstudio, plus $8-10 shipping, something in that range.
Soldermask color is more, I don't bother.
Top & bottom silkscreen is standard.
5 pieces of up to 15cm x 15cm would be $66.20,
10 pieces $132.40
I try and get my designs in the <= 100mmx 100mm size to keep the cost down.