Contactless IC Card Reader/Writer

• Where can I buy the products? What is the price?
• How can we develop a software for the serial reader/writer?
• Is radio related compliance required?
• How can we choose RC-S46X series and RC-S49X series? What is the difference between RC-S46X series and RC-S49X series - only the size?
• I need a specification sheet for the serial reader/writer to develop using the products.