Bluetooth HID Module
Normally module level products are aimed at prototyping and low-volume production. Therefore they tend to be produced and sold in smaller quantities at a higher cost than their chipset counterparts, and of course the companies that make them want to turn a profit on their R&amp;D work.

If you're prepared to do the additional design work yourself you may be looking for a Bluetooth SoC (system-on-chip) solution. One example is the TI CC2540 that is currently shown at around $2 a piece in 1k quantities. You'll need to develop your own board and firmware but they do provide a variety of reference designs and a software stack along with evaluation and development tools to assist.