Most of my online DVD shopping is via Amazon-UK, since older titles that go on sale there are far cheaper than their R1 Amazon counterparts, and I have a local source for R1 titles anyway. Seriously, their sale prices go as much as 70-90% off suggested retail price sometimes!
Unlike Amazon US, which usually uses larger boxes even for 1 or 2 DVDs, Amazon UK is the opposite - even for boxed sets, they usually ship these in cardboard sleeves that've been folded over, so they're not bulky. As a result,
hindi masyado mainit sa mata ng customs inspector. I've never had a tax issue with my orders with Amazon UK, but my package value has never been over £50.
Like gadgetguru mentioned, shipping time is more efficient with Amazon UK. I'd say in general, my Amazon UK orders by the cheapest shipping option (Royal Mail) arrive in 7-10 days. There's only been one time this has not been met, and it's my current order, which shipped out on April 8th pa.
It's well over the April 20-30 estimated shipping date, but I gave it a little extra time due to the Labor Day weekend. I'm complaining about it today. Unlike gadgetguru, all my orders are picked up at the post office, though, whether I ship them to my QC or my San Juan address.
By the way, Amazon-UK has a really good deal right now on the James Bond Ultimate Editions Collection - the first 20 Bond films for just £99.96 - 63% off the SRP!