I'm not seeing much in the way of 'inexpensive' from the ones I've looked at.
According to an article Gene put out here on Audioholics some time back, WiSA operates on 24 tunable frequencies in the 5.2–5.8 GHz range. These channels were originally reserved for weather and military uses, and consumer devices are only allowed to use these critical channels as long as there is no interference. A WiSA-certified system constantly monitors for interference and instantly jumps to a new channel if any is detected, and does so seamlessly with no audible dropouts.
As you can see, the requirements of the platform do not lend itself to “inexpensive.” Especially when you consider that the speakers are required to have both amplifiers and wireless receivers on board.
If you look at the reviews for most wireless audio gear, such as HTIB’s or sound bars with wireless subs or rear speakers, you’ll note a high margin of negative reviews, often as much as 30%, and that the great majority of the complaints are related to wireless issues – noise, drop-outs, paring issues, etc. In that regard WiSA is probably one of the most reliable wireless audio products on the market.
Still, WiSA is not without its shortcomings. AFAIK it does not lend itself to modern auto room correction or secondary zones, features available in most AVRs these days. And AFAIK the only way to get streaming from it is via a WiSA TV, or another hub device with HDMI inputs for a Roku or similar device.
Regards,
Wayne A. Pflughaupt