It really depends on what you purchase. I've purchased complete TV sets for much cheaper than Amazon US,DD, etc (even on Goldbox days). So even with shipping, the deals are superior, when they have their sales. I've picked up Blus at Amazon UK and Amazon.de that were not available in the US, and are not announced for the US (niche, or I wanted them now), for less than most of Amazon US's B2G1 or BOGO sales, at times.
As far as Blus, if you have an LG BH200 you're in the clear, as there is a hack, and as many have pointed out SD players can be made region free, if there is a hack. However, be aware that UK items are PAL format, so your player also needs to be able to display PAL on your US standard TV (NTSC). Some cheap players can be hacked and then are region free, and can display PAL. Others cannot, even higher-priced ones. LG BH200 can display PAL, and be made region free, and Toshiba's XDE can also be made region free. If you don't have a region free BD that can play BD's from all over, see what Blus are "locked" and which are "unlocked" at blurayregioncodes.com. Good Luck!