oly5050user:
had a customer come in with a used alum 80 purchased on ebay..he paid $80. for it..We sell new alum 80 for $210/$220.with a free air pass for 20 fills .Fills go for $8. in this area, so air pass has a value of $160.Customer needed a vip and he has 1 year left on hydro.Buy new tank at lds and it would have cost $50./$60.in not too much time.Not too much of a deal after he paid for used tank and vip.Trust your lds to teach you and if you had a good experience trust them to equip you.Most are not out to rip you off but to build a long term relationship.
People can take any one given example, good or bad, and turn it into an argument for or against Ebay, but that argument is rather bunk. The fact is that overall Ebay is a great way to shop. Recognize that one is NOT purchasing from EBay, one is purchasing from an individual, or business.
So the first key is judging the seller. Some vendors that are on Ebay are DiversDirect, UnrealFind, Adorama, Ritz, ScubaJoe's, and a TON of others. So if you can find a product at below the store price via Ebay, than you are getting a bargin. If you can just call the store and get as good or a better deal, then do that when buying new.
For individual used items, sellers are generally honest. I have over 160 transactions on ebay, and have had only one item that I was unhappy with. In that case I sent it back to the seller, and received a full refund I (camera lens that would not focus correctly).
One must be a smart shopper, and weigh all the considerations. If the LDS sells an AL80 for $200 and includes 20 air fills then maybe that is the way to go. Our LDS does not include any fills with their Al80's (well maybe one) so I can buy it from ScubaToys for $130 shipped new, and that is a much better deal.
I picked up two used tanks locally, nitrox clean, new hydro and vis for $80 each. This was not Ebay, but an example on how one can shop around to save some $$$. Had our LDS offered 20 free fills for their $200 price tag, I likley would have purchased from them.