Loving this thread!
Ordered this mermaid blanket for DD. Went for the adult size so that I can steal use it too. Though may have to order myself one if the quality is good. Price is up a little now - think I paid around £15.
Thank you for the link to the helicopter. Snapped one of those up for my gadget mad dad who will love it. And only £4.68 with free p+p. Bargain!
Sorely tempted by the Benefit makeup kit. My sister has a financially unhealthy addiction to expensive makeup and this would be right up her street. Though she's off travelling just before Christmas, so I might need to think of a more practical gift. Yawn.
Links for bits that I've found:
Unicorn slippers for £5.04 with free p+p. Adult sized but might do a teenager or an adult, who like me, lives in fantasy land
Reviews are very good.
I got DD one of these personalised Hogwarts acceptance letters last year and it was a massive hit. Might not seem like a bargain at £8.54, but you get a lot of additional extras and DD has spent hours incorporating the pack into her play. We've spent a lot of time frequenting Diagon Alley to buy her an owl and a broom before I have to stick her on the train and wave her off...
It's no wonder my neighbours always look at me like I'm certifiable.
Harry Potter time turner necklace for £2.49 and the Deathly Hallows pendant for £2.99, both with free p+p. Oh, and this eBay seller has the officially licensed Harry Potter charms for sale, which would fit a Pandora bracelet. £3.99 each with free postage. Again, not necessarily a bargain but awesome for HP fans.
Amazon lightning deals - dream catcher adult colouring book at £2.49, jumbo 3D Sudoku book for £2.97 and a Vinalito wine Oxygenator Flavour Bouquet Enhancer for £10.19 for any wine lovers - has fab reviews.
Warren James has a huge sale on Swarovski Crystal jewelerry atm.
Very Exclusive have a big sale on. All designer bits that are way out of my price range even in the sales, but might be worth a nosy...for ideas 

My local B&M Bargains had some fancy black Tassimo machines in today in case anyone's in the market for one and wants to go scouting.