I want to make and sell a device with cellular IoT (data only) and Bluetooth capabilities. Can anyone comment on the least expensive path to certification for sale in the US market? For example, if I start with an FCC and provider certified cell module, such as this one from Digi, and an FCC certified Bluetooth module, such as this one from Rigado, I'm assuming that my final device will still need some sort of FCC certification before I can legally sell them. Can anyone comment on what the required certifications would be, and a rough discussion of the costs?