How much does this cost to the nearest dollar?

Happy Hacking Keyboard Professional
The rational keyboard layout that has not changed from the first model is limited to the minimum necessary keys by combination keystrokes, and the key pitch remains full size 19.05 mm, realizing a functional compact body of just over A4 half size. An English layout model that maintains excellent portability by minimizing the increase in size and weight due to the addition of a wireless unit and battery compartment. A wireless model based on the Professional series with an ideal key touch Supports multi-devices such as smartphones and tablets in addition to PCs that support Bluetooth HID profiles The power source is an easily available AA battery. Operates for about 3 months with 2 AA alkaline batteries. Also equipped with a USB micro-B connector for power supply Adopts a capacitance non-contact method

Price is $339.00
Price: $339.21