ouch, i definitely can't do two if they're going to be marked up to twice the production cost. maybe one.
i don't get where the extra $10 or so per plate comes in for gas, or why you cant just have the plates shipped to you (heavy, I understand, but should be cheaper than gas if the markup needs to be that high?). Also, if it makes it cheaper for them to ship them to you, I would definitely not say no to an aluminum plate.
I'm not saying you dont have the right to charge what you think is fair, but doubling the cost seems drastic at first and I'm just curious about where that money is going.