Just got a sigma 18-50 f2.8-4 for use with my t2i (550d) for when girlfriends son wants to use it, as cheapest in uk was £165 I got it for £110 delivered from Digital Rev. This was delivered by courier but I picked up from Royal Mail collection office - no duty paid at all by myself. They also supply a supposed 12 month local warranty which I hope I never have to use.
Im off to the states and thought about buying a 6D from over there, but from Dig rev its £1159 its crazy that in UK i will pay over £1500 for a 6D, I could get a 6D and 24-105 for not much more.
looking at the price of the 70D £1059 for a body in the UK and $1199 in the USA a saving of around £250 on the uk price. Assuming you go to US on holiday.
I don think buying from over seas hurts the main camera dealers but the big online retailers such as amazon.
Those figures for the 70D are the official Canon prices, which are really unfair on us the UK public and our dealers. To be fair, the UK price includes 20% VAT, and you will have to add only a much smaller sales tax to the US price, as it is not included. Even so, after removing the VAT, the UK price is £882-50 = $1341; that is £94 more than the US price, not £250. You could, of course, go the US and then smuggle it back into the UK to avoid the VAT - a centuries old tradition.
Lenses are worth importing as Canon honours their international warranty. But, they do not honour warranties on bodies.