Well is it suppose to be a funny pressie? Normally secret santas are just a joke.
If so they have funny boxers in pennys – Ones with things like "Pulling pants" written on them & you could include a packet of condoms -haha
Also, there is a mens shop in Drogheda town centre, that always does funny t-shirts – i buy them for my younger male cousins. I think they are about a tenner.
Seeing as he runs marathons, you could buy him a packet of plasters & a tub of vasaline – blokes put them on their nipples to stop friction burns.
For africa – maybe mosqito repellent.
If its a secret santa, no one will know its you, so have a laugh with it.
Please let us know how you get on?