If it’s in solid condition, might be okay. Drive it over a few speed bumps to check suspension. $4,500 seems more fair than $6k.
I’ve been checking out these Mk2s too. If the battery is dead or weak, can you just keep driving and use a bit more fuel? I drive a Focus Mk2 auto and it’s doing 9.9L/100km. Would a Prius still save fuel even with a tired battery?