Yeah i think i paid about 300 total in 98 for OW and AOW. Most if not all of my yearly dives are in FL so my tanks get used every dive. Have a local shop that gives free air fills for a year with every tank you buy so one of my buddys buys 2 new tanks every year and then sells off the older ones. He dives 3 to 5 times a week tho so for him it works out. I guess depending on how much you dive in the long run it may be cheaper to rent but considering a used alum 80 is 100-110 ready to dive it dosent seem like a huge expense compared to what most spend on regs or a wetsuit. We dive just about every weekend so for me it works out.