I'd offer $100-$125 for the 3 newest. The nicest thing about having several tanks is that you don't have to wait for a fill to go diving or find a fill between dives.
I never think I have enough tanks (I think I have about 15 now of various sizes.) AL80's are great for practice dives. If you ever decide to try doubles, they make a great starter set. They're easy to sell if you end up with more than you need (which I could never imagine).
I never think I have enough tanks (I think I have about 15 now of various sizes.) AL80's are great for practice dives. If you ever decide to try doubles, they make a great starter set. They're easy to sell if you end up with more than you need (which I could never imagine).