Slapfaan, you might want to contact either the hotels or tour operators directly and see what crew discount you can obtain. You may find with occupancy a little down that they'd be happy to give it to you at a good rate just to fill the room. You may never know.....also the price you'd get at say Safari Lodge or one of the others may make it worth your while....give it a bash.
A word of advice don't change any money in the streets.........