I use the USPS shipping Calc. but it doesn't allow for the flat rate envelopes. I have one item that we want to ship in those flat rate envelopes, so how can I handle it differently? Can I have a flat rate fee added for that item and the rest use the calc?
For example, one person bought the book and it was $8.00 shipping, yet its only $4.60 with the flat rate envelope.
I have considered making it free shipping and add the $4.60 to the items price, but not sure how the higher price would go over even IF postage is already added. Is that my only option?

Thanks ~