I have some experience and agree with the comments already posted. I have bought from Gunbroker.com, Landsborough, Wards, BigE, Switzer's and EE. In every case it was to acquire something I really wanted and hadn't found elsewhere. Gunbroker is the most expensive, for the exchange rate, even on the shipping charge to the FFL, but also for the import fee, shipping and taxes (Cdn $350.00 to $ 400.00 more). I've used Prophet River as the importer and been happy with their service. Not so much with the ten to twelve weeks it takes from the time of purchase until it arrives in your hands. I must say I have been happy with my purchases and can't really complain about the total cost because there was nothing to compare them to.
Shipping charges at Landsborough will quickly drive the price to ridiculous levels. The rest have pricey shipping charges as well but not quite so bad. Bancroft is close enough that I can attend Switzer's, view the items, save 5% on the premium and pay no shipping.
Having said all that, EE is definitely the way to go. Best pictures, best descriptions, and the best people to deal with.
No more auctions for me. Well...maybe for something really special...