Did you know that if you send a letter to Santa using this address (don't forget to put a first or second class stamp on it):
The Royal mail will send a reply to you (or your child) free of charge just make sure you add your return address on the letter. Apparently Royal Mail guarentee that they will send a reply as long as they receive your letter before 13 December.
So save your money don't bother with the rip off £2 letters from people selling on ebay spend your money on a stamp and a little something extra for your child's stocking.
I found this out by going on the GMTV website around this time last year (october 06). go into the money saving expert bit and go on the 12 money saving tips link.