I would like to offer a free shipping offer for one specific product. The free shipping must be valid only for the First Class shipping method; all other shipping rates would be at full price.
I tried the "free shipping" variant for the product; however, there are several issues:
a) all shipping options, including express mail, become free...which I don't want
b) in the shopping cart page where one can select a shipping method, the regular shipping rates still appear. It's only when a customer goes to enter the credit card information does one see "$0.00" for Shipping of that particular SKU.
I looked at the coupon method, but I don't see a "free shipping" option. If I use a dollar amount on a coupon, the dollar discount goes against the product price, not the shipping costs.
Any suggestions?
Thank you.