I always get mine from eBay and can often get them for about £12.00 (inc postage) per 50. You need to time it right though because they are very popular and it sometimes takes me 3-4 attempts to 'win' some. Also sound are quite expensive particularly if they are selling single boxes of 10 or 50 so you need to check prices carefully. I bought a box of lancets for my fastclix about 2 years ago for about £9.00 and they are still going.