If you're willing to go overseas, places like iTeadStudio and SeeedStudio can both deliver within 2 weeks. 48mm x 62mm puts you in the range of a 50mm x 100mm board. 10 boards for $22 plus shipping. It's that shipping that will determine how fast you receive it ... faster = higher shipping cost.
I revised my board a bit, it will work with internal 8MHz clock which means fewer parts needed on board, that made my final version a bit smaller than 5x5cm. The oversea option is looking better due to much lower cost, 10 5x5 boards for $10
Now if I can figure out how to convert eagle to gerbers...
US industry does not look competitive for small orders. Most charge a setup fee that makes the cost non-competitive.
None (but oshpark apparently) that I have queried do the compiling of designs into a group-buy panel for small lot purchases.
I use elecrow.com services.They let you choose the color of the board with no extra cost and is more cheap than Iteadstudio IMO.I really recommend then.