Amazon is selling "Rollercoaster Tycoon 3 Deluxe" for £7.96 plus £1.69 Delivery.
It's eligable for both Super Saver Delivery (free P&P if you spend £15 or more) & Amazon Prime.
Next best price seems to be £14.99 from SoftUK.
This version includes the original "Rollercoaster Tycoon 3" game and it's two expansion packs, "Soaked!" and "Wild!".
RCT3 Deluxe combines the excitement and roller coaster, theme park fun of the Roller Coaster Tycoon 3 with included expansion packs Soaked! and Wild! Now enjoy more options than ever. Build your own water slide or create your own safari with real animals. Watch guest reactions to your ultimate theme park!
* Grab a front seat for the ride of your life with the jaw-dropping Coaster Cam
* See every detail in stunning 3D with fully controllable park cameras
* Cope with changing weather patterns and enjoy beautiful vistas, sunsets, moonlight, and more
* Add your own mp3 music to backgrounds, rides, and fireworks shows
* Spend the big bucks and build with unlimited funds in Sandbox Mode