I’d do it for $50.
Used - Very Good condition in Amazon warehouse deal for $110.01 with free prime shipping.
I got one of these and added it to two Echo’s on my headboard (sub under bed). So cool. I lay on my bed and it’s like having headphones on. And any song I can think of (I pay for Prime music upgrade) I get to hear. Sounds fantastic. : I bought refurb and payed about this as a package w/ one echo = already had one.
Are you able to do stereo sound?