I've been looking out for a smart 3d TV and had this emailed over today. Less than £300 delivered and it ticks a lot of boxes 4k UHD, smart tv, 3d, 4 hdmi ports and it's Toshiba, which I rate. I have a smaller Toshiba and bought it as they were highly rated on Which and have not been disappointed, so I'm tempted to replace my 10 year old 40" bravia.
I'm sure people will moan about it being costco but for those that have a card it's a great deal and has a 5 year warranty!
I've not been in my local one but it might even be cheaper in store. I've noticed in the past some online offers are a little more expensive to cover the delivery.http://www.product-reviews.net/2015/11/25/toshiba-48-inch-48u7653db-ultra-hd-tv-review-bewilderment/