online dive purchases

I am considering making a few purchases over the coming year. The local dive
shop while a great resource, is very pricy. I have been looking online and
have found a number of US online equipment outlets that are considerably
cheaper than I can get here at home (central Ontario).
Is there anything in particular I should watch out for, stay away from, or a
recomended online Dive store.
The one I have seen that has the best prices so far is "Liesure Pro".
I hesitate to bypass the local shop for a few dollars but we are talking
hundreds. and in some cases almost half price.
Comments welcome