Was £29.99, then £19.99, now £10.43.
VESA 75 & 100 compliant
More details on their website (see direct link) - though it's priced @ £40 there ?!
Found in Altrincham Tesco Extra. There were loads on the shelf, so expect they'll be quite easy to find elsewhere.
I bought 2 so I can mount my old pair of 19" TFT's either side of my 42" Tosh. 1080p primary display =)