how much do you pay for HPA ???

i am getting an 88 cf carbon fiber 4500 psi tank and i called the local paintball shop and they told me it is a buck per 1000 psi
no matter tank size is this a good deal?
i mean even if it isnt for 5 buck to fill and 88 cf tank if i put the numbers in right i will get something like 30 condor fills with the tank