As you say, that’s 9 years ago and MSRP, if you go down the Toyota route. I can get a reconditioned entire battery pack here with a warranty for £400, and often a good Mk1 is around the thousand pound mark, I’ve seen them needing batteries for closer to what you saw that one for. A Mk1 and a replacement battery could easily be had here on the road for £1000.
If you’re handy with diag kit, 9 times out of 10 it’s just one cell module that goes duff anyway, those can be had for £20-£30 and it’s not a horrendous job to change them. Lots of taxi drivers do it this way, they will buy a full pack from a crashed one or keep one from a crashed taxi, and those cells are used to keep the other Priuses going on the cheap. The fact they use NiMh cells rather than Lithium based for the majority of the Prius range helps the cost a fair bit.
Anyway, thread’s being derailed now, crack on with the uglies.