Looking to resell, what price?

I am looking at reselling vaders (maybe), or another decent one.

I already have a decent amount of people signed up, as I was waiting to see how many before I decided. I have signed them all up through me, so i am in control of all of their accounts anyway. I also have many more ready to sign up, I have just been delaying them, slightly for now.

What price should I be looking at for the panel and the credits?

I have been given two prices that vary by quite a bit, but also the credit system is different so it's harder to work out.

I would prefer 1 credit = 1 month or an even amount. I find the ones that divide them into 7 ridiculously hard to account for (maths isn't my strongest, but it doesn't have to be that difficult anyway).

Also how does paypal work through it, just a normal business account?