Well, heres my prob:

I ordered 2 of their $2.99 .us domains... and got screwed because they charged my cc $5.99, stay away from theese crooks!

If they charged you more than you agreed to pay that is grounds for a chargeback. If they won't refund your money, take it up with your credit card company. :)

You do you $2.99 + $2.99 = $5.98 + $0.01 for some reason

It was $5.99x2 jheslop1 meaning that they charged me $5.99 for each domain.

Have you contacted them regarding this matter?
You should try and contact them and see what they have to say about this.

maybe you were charged for com/net/org ? by mistake.

try contacting them your best option :)