Choose Emerson Media, the total costs will only be 61.95 pounds sterling or about HK$805.
The only downside is it will take 2-3 weeks for delivery.
UPDATE: Sun-Shine is now selling the Thomas & Friends ultimate Collection for 99.99 Pounds sterling. It's not available from the other sellers. So if you still want to buy it, u might need to wait until the price decreases. The prices in Amazon fluctuate a lot. From my experience, I think the prices adjust automatically by demand and supply.
UPDATE 1: The price for the thomas & friends box set has dropped to 28.86 pounds.
UPDATE 2: Sorry the thomas & friends box set is out of stock already. (又一次俾bk mami 買到斷咗市)