This specific system has been outdated for many years. This is the IV version, and it was introduced in 2015.
It needs to be updated to include the technology of today, like bluetooth, at the very least. If you're buying an electronic sound system today that is not already bluetooth compatible, beware. It's old before it arrives. That's why QVC is also pushing that adapter for bluetooth.
That's not to say this isn't a wonderful sound system. It's just that it's antiquated. It's not about finding the parts. It's about no universal demand for old technology. Try finding this model at any other retailer except Bose itself, or maybe eBay.