I got one off ebay a couple of months ago, I actually paid ?21 for mine though so be patient a let a few go by. Most sellers put one on as an auction then list a few as buy-it-now auctions in the hope that bidders who didn't win the auction will go for the buy-it-now ones at a slightly higher price.
Anyway the chip works fine, seems a bit smoother in the mid-range. I'm not really sure whether it has actually added any power but at that price I was happier with a smoother drive. I think you only really notice a power difference if you have other mods on your car e.g. long duration camshafts, performance exhaust, free-flow air filter etc. All in all worth trying for the money, mine came with a decent set of colour instructions and I managed to fit it in about 30minutes. Dave Hawkins on here also has one so you may want to ask his opinion.
Toby