I have been going to two LDS's in my area, and I also buy online. Last year, I was pleasantly surprised to find that one of them could sell me a Worthington HP 100 for about the same price that it would have cost from Leisure Pro, and it included a VIP and air fill. Needless to say, I bought it. However, the other LDS is overpriced, so I mostly get hydros and VIP's, and buy air and small items there. I don't mind paying 15-20% extra at the LDS - it is like a tip at a restaurant. But when the price difference is 50% on a high-ticket item, I buy from Leisure Pro or one of the other online discount warehouses.
By the way, some of the value of authorized dealers is overrated. I have a Scubapro MK5 and an R-190 second stage that was upgraded to a Balanced Adjustable. This was supposed to have a lifetime warranty since I was the original owner. However in the 39 years since I bought it, I have lost the paperwork. Now the authorized dealer tells me that he can't get parts for it (even though they are available on eBay) and Scubapro won't give me any help unless I somehow find my original paperwork. So what good did it do me to buy from an authorized dealer and support Scubapro's price-fixing business model? So I bought a new Scubapro regulator on the online gray market (imported from Europe, where price-fixing is illegal - as it should be here), and saved almost 50%. I don't fault the LDS for Scubapros pricing - Scubapro does it to them by not allowing them to compete fairly.