You can get a free box of 10 Durex Play Sensations lube sachets worth £3.99 when you spend at least £1 at LoveHoney. The cheapest item I could find was the LoveHoney User's Guide to the Rabbit for £1.50 and the Light Up Extra Glow Sticks for £1.50. Lots of other cheap items from £1.99-£3. Delivery is free.
I have updated this to take you to the link mentioning the offer, as it seems the deal doesn't work for all unless they start from that link. To find the book, just do a search on LoveHoney for "rabbit book," or "glow sticks" for that item.
Put the book, or anything, in your basket and the Durex will be there, too.