is it not possible to rent something like a Sony Snap Lab in SA?
Gerry, what are your wait times per print?
I have no doubt that you getting good results but is using a consumer level printer good enough?
At very least I would use 2X what Gerry recommends.
Also try the Glam Cam URL
a friend of mine makes them, I think they rent them out. Very cool for large events. Its a Prime Media product.