Some LFS do things differently, and ideally, it's best to drip acclimate them. This can be avoided when the temp and salinity of the water they are going into is the same that is in the bag. Personally, I would want to get the fish out of that nasty water in the bag as soon as I could, especially if it was just shipped in fresh from the islands.
Do note, that that only advantage that drip acclimating has is that it makes the fish transition with a little less stress. Acclimating properly won't keep a fish from getting Crypt or any other ailment, it just makes the move to the new home a little less stressful.
When I get a new fish, I check the water parameters of the LFS water, and then match them in my QT. I then bring a nice clean bucket to the store and bring the fish home with a healthy amount of water in it. When I get home, I don't acclimate it if the temp of the water in the bucket is the same as the tank. Most cases it is, because I only live 8 min. from my LFS.