First post so please be gentle.
If you have been looking for one of these at a good price, this is the cheapest I have found. On amazon/ebay etc they range from about £4 - £15 plus delivery!!!!.
We ordered 2 (Purple & Blue), very quick delivery, ordered on a Sunday and they arrived on the Tuesday.
Only thing to watch with this product is that there are 4 colours available and it seems to us that each colour has a slightly different 'click'. Our puppy Rory gets a bit confused if we change clickers, so we now only use one of them. I would suggest that if you need more than 1 for the same dog, get the same colour to be safe.
On a positive note, if you have more than one dog, you can get different colour clickers for each dog, as they will all have their own sound.
We have found 'clicker' training great for Rory, he is 4 months old and is very nearly fully trained both on and off the lead. There are some fab training videos on YouTube if you need help.
Hope this helps someone