Amazon.co.uk offers The Complete Toy Story Collection on Blu-ray for $19.35 (£14.99). Add it to your cart to drop it to $16.12 (£12.49). With $3.98 (£3.08) for shipping, that's the lowest total price we could find by $5 (outside of the deal below), although we saw it for $2 less last November. It includes all three films and special features.
A close price and for new customers only, Zavvi offers it for $20.16 via coupon code "WELCOME" plus $1.44 for shipping. Note that although the films themselves will play on U.S. Blu-ray players, the extras and special features may not.