Adding samples to a product

Hi fellow Zenners,
I have a simple question that I've scoured the message boards and internet for an answer but I can't find it. I'm working on creating an online fabric store, currently being tested at fabricsthatgo.com/store

People can choose a fabric, enter their desired yardage, but I need to add a button where they can order a fabric sample. All the fabrics will have a flat $2.50 fabric sample cost and no shipping cost, so if they go through the site and order 3 samples, they will only pay $7.50. Any suggestions?

Thank you all very much,
Eric M.

What shipping method(s) are you using on your site?

If you ship by weight, you could put the weight on the Attributes instead of the Product and then use 0 weight on the sample attribute ...

Thanks Ajeh I'll look into that. I wasn't planning on shipping by weight but if that is the only way I just may have to...