There are not too many modules available yet, and as usual they are considered OEM products. So the average developer has not the remotest chance of obtaining one unless some heroic online shops such as our beloved Spark Fun guys manage to put them into their program.
I know of one available module, it is the Falcom JP10. Google will bring you there. Currently you can order it at an obscure webshop in Germany, but only as SMD BGA part. So no playing with it without custom PCB and reflow oven 