I buy from what ever sorce gives me the best price and service.. Need it be on-line or local dive shop.. I don’t owe of the the local dive stores anything.. Its called business.. Dive Shops in my experience don’t deliver what they promise.. Also bad marketing skills and service.. All retail stores need to sell thier stuff on the internet to survive.. Need it be store stock, classes or trips.. Thank goodness for the large internet houses to help keep the local dive shop prices down., May the best man win to get my money.. Mike