Have been looking for best price on this for a while now after release of the GOTY edition. Shows in stock priced at £39.99* but if you use voucher code dt7aquwhf as a first time order there's £5 off and Quidco is a whopping 11% bringing £39.99* down to £31.14
GOTY has codes for new extra maps. (800 points otherwise)
UK version (not import) so if you eventually trade it in you'll get best prices.
*£34.99 is new price from 8/5/08 to 15/05/08 see below