Purchasing 07 w/ 270k

welcome!
wow! sounds like a fun project! you should have every concern.

 

oh, i know, believe me. but, to be honest, i'm actually an amateur. if you have a specific concern, i will be happy to answer it specifically.

 

Hard to say with an older high mile vehicle, can you post the service history?

Whats the remaining warranty on the rebuilt HV battery?

Have you had a chance to drive more than one Prius already, if not you should test drive a handful so as to get a better idea of how other vehicles behave differently or the same.

Might be best to continue shopping around, and after test driving a bunch of them at different price points you will know the right one when you drive/see it.

Used 2007 Toyota Prius Liftback 5D Mileage & Options – NADAguides

Start with the lowest price from the link above.

 

Before I bought it I would see if you can get some sort of hybrid battery warranty.
Even 30 or 60 days would help you build up some cash for when you have to replace it.

I would pay much less for a car with that high of miles.

Would be nice if you could take the car to a hybrid mechanic and have the megg out the transaxle.
To make sure you aren't buying into a bad transmission.
Hybrid Shop may have already done that as an upsell when the battery was worked on.

Can you do repair work yourself? (ie replace transmission, work on battery pack, etc)

I know I've seen prices under $2,000 for a car with 225,000 miles on it. But each market is different.

 

Outside of the obvious wariness of mileage that high impacting the engine and transmission, my concern would be the suspension, which would likely need replacement (speaking from experience: our car is over 200k and likely needed suspension service).