I'm looking for some low-cost Bluetooth modules for the ability to easily add Bluetooth capability to some of my designs. I suppose something under $20 would be acceptable. I need the module to be self contained--just solder onto the board and communicate to it with a micro. I module that manages itself would also be desirable. A SPI or I2C type interface would be preferred.
Does anyone have and leads or sources for something like this? Thanks.