Depends on its condition... In my experience among battery rebuilders is $200 is average price for a battery pack core that has a small number of failed cells.
Or rather a fun project learning to rebuild a battery pack successfully so you always have a spare on a shelf for yourself and friends and family. I wouldn't buy it if you don't want to learn how to do all that.
It's a technically a battery core, which I wouldn't go into thinking its plug in play but needs work. And the challenge of turning it into a fully tested and healthy pack changed my life back in 2018. I developed so many skills and a new income opportunity, as well as alot of wack-a-mole PTSD when I finally gained enough competence to successfully rebuild battery packs back in 2018. I highly recommend the experience! It's the ultimate deep dive down the Priuschat rabbit hole! Of course these days, I just buy Sodium...
It's a great deal if you have the money and space for it. If you ever need any traction battery circuit boards, it's going to cost you more than that. I wouldn't place any hopes on any of those battery modules being good. It's from 2009 and no telling how long it's been sitting or where it was stored. Any bad modules in the stack will draw-down any good modules - batteries wired in series.