The SoundScribe Plus kit is $275. In the box: a 12-inch carbon fibre plate on a solid pine body measuring 13⅜ by 13⅜ by 1.5 inches, Bluetooth 4.0 with a 3.5 mm auxiliary input, a 110–230 V supply on a US plug, silica-free sand with a shaker, a cleaning brush, a manual, and a frequency-generator app with pattern presets. Replacement sand is $15 and a spare supply is $20.
What the page does not state is as interesting: no driver specification and no usable frequency range. For anyone comparing against a home-built plate, that matters, because carbon fibre rather than brass or steel gives a different set of modes at different frequencies, and without a stated range you cannot tell in advance which figures the kit will reach.
A reasonable price for a finished object. Not a substitute for knowing your own plate.