All of Ian Fleming's Bond books put out by Amazon imprint Thomas & Mercer are onnly $1.99 each right now (at least for US customers). I don't think their rights cover the UK, but IIRC they were "North American Rights" so Canadian's may get the lowered pricing.
Publication Order
Casino Royale
Live and Let Die
Moonraker
Diamonds are Forever
From Russia with Love
Dr. No
Goldfinger
For Your Eyes Only
Thunderball
The Spy Who Loved Me
On Her Majestys Secret Service
You Only Live Twice
The Man with the Golden Gun
Octopussy and The Living Daylights
Amazon's Ian Fleming Page
Bond Novels Wikipedia page
These books can also be "checked out" of the Kindle Lending Library (one per month) if you're a Prime member.