Looking for used batteries (UPS , Servers)

You must have noticed that constant and repeated power failures are fucking up T.A.M.I. servers and internet. We have several medium-sized UPS handy, but need batteries. An average new automotive battery costs $100, but a better solution is if the regular junkyard visitors can find a few used marine/car/motorcycle batteries?

דיברתי עם חבר שלי שאבא שלו מוכר סירות. אם אני שוכח לעדכן, תזכירו לי בבקשה