Thats expensive, $100. Here in the UK their cheap as chips, I sold a 17" one for £30 the other day but alot are free when they get too big.
The pic above is a very unusual one, most are very dark in colour and more so when big. But it all depends on where in africa they were caught as soo many sub species. Great cats which get very tame and can be kept with small fish.
for some odd reason they have gone UP considerably in the last 2 yrs. around here 6inchers are about from 50-70 dollars when they used to go for about 20-35 at the same size