I ended up buying a bumper order from Sentai's own site using a proxy shipping site (Shipito) last week. Granted, it's going to cost me around £100 for shipping & customs in the end, but for some of the collectors editions alone I'll have saved a bit. I definitely would have waited to order Shirobako from WOWHD if I had known the price was going to end up comparable to Sentai's website, although by the look of both WOWHD & Deep Discount, many of the titles I bought (the Chihayafuru collector sets, dvds like Windy Tales or massively reduced titles like The Book of Bantorra) either aren't available on the offers or significantly more expensive, so I won't feel too salty about other sites playing catch up. Well, as long as the post doesn't chew them up.
I am curious why so many of these Sentai/Section 23/Maiden Japan titles have all plummeted so low. Even by sales standards, some of the stuff on Sentai's own site is absurdly cheap. Hopefully it's not a sign of financial woes.