There are certianly some bargains out there. I bought a semen tank from ebay and it was a good tank. shipping was high I thought , like 42.00$ . I paid about 275.00 for it and it was about 5 years old. I could have bought the same tank from my Semen rep brand new for 475.00$ , he would bring it and a 5 year warranty. Some of the tanks on ebay are very old , in fact like 20 years old . You dont want a tank that old to put you semen or embryo investment in . Those tanks are just not dependable and if you have to fill it more often , it will just cost you more to own it. Sometimes the cheapest ends up costing the most. Some of those old silver MVE Apollo and Orion and Taylor -Wharton tanks on ebay are 20-30 years old. Just be careful .