The si4707 is just under $17 ea from digi-key. You would need another way to solder it to your board like an oven/solder paste. I tried to solder under microscope and still couldn't get it done right.
Chip has great docs on how to program. I2C or SPI is available.
That receiver board u saw was populated by a contract electronics assembling company so I could make sure I didn't screw it up.