In case anyone is interested, I found a small zippered bag that perfectly fits the ToneWood Amp. It's $8 on Amazon. It is the ERCRYSTO Universal Electronics/ Accessories Soft Carrying Case Bag (Small).
It has a main compartment that fits the ToneWood, and two mesh pockets, one of which I use for the cable.
Apparently ToneWood does not allow links to external sites (which is reasonable — neither does Amazon), so the link above does not work. If you search on Amazon for the ERCRYSTO Universal Electronics/ Accessories Soft Carrying Case, you should find the item pictured. I bought the one circled in red.
Guess I was too hasty. When the link I posted yesterday did not appear, I posted the screenshot of the Amazon page today, thinking that external links were not allowed in this forum. Then both appeared simultaneously this afternoon.