The best time to go to Magic Mountain is in October, the last week they are open during the weekdays (the week of Halloween) on that Monday, Tuesday, or Wednesday.
You can replace the hybrid battery pack for $600â$2000. It will be more expensive to do it at the Toyota dealer, and the model of the car also affects price. I have had 3 Priuses in my family, and only had to replace one battery pack (200,000+ miles). I ordered a replacement battery pack from a rebuilder and had it shipped to my mechanic, who had no problems changing things out. The total cost was $1200, back in 2011.
Prius Wiki. Lifespan/Operating costs. Supporting pages against the myth that the Prius only lasts 109K miles (per CNW junk science), battery needs to be replaced every 3-5 years, 50K miles, etc., battery costs $10K, etc.