And don´t forget you can also use your jampoints up to 30 %I think right now you can get 500 credits for $150.
That's 30 cents a credit.
125 x $0.3 = $37.50
$37.50 x 3 plug-ins = $112.50
That also leaves a balance of 125 credits... just enough to buy another 125 credit plug-in or...
EDIT: previous poster beat me to it.
I´ve paid 87 € for 500 credits !
That´s 21,75 € for one API