Back aro prices will vary greatly by market. That price seems a little on the high side, but then again how many black aros do you see for sale in your area?
Over the past 3-4 years, Ive seen baby blacks aros go for any where between $30-$120 from online vendors, when they are in season(spring time). Though with seeing that this year they are available now, it could mean that there are captive bread now entering the market. Usually you don't see them available until late march through early june.