The Lapu Lapu costs about $14 in the pineapple. You can order it without the pineapple for about $8.
If you are looking for specialty drinks at AKL, walk down to the small bar adjacent to Jiko (not Victoria Falls) and try a Zebratini if you like sweet desserty drinks. They have a menu that isn't the generic drinks menu with a few other specialty drinks on it, and you can order from the Jiko wine list.