Thanks for the positive feedback. I got the supplies from this Etsy seller. Etsy :: Terbear Collectibles-Custom Handmade Rubber Stamps
I think you can get the hardware cheaper on eBay but she sold the webbing by the yard which was great so I got a bunch of different colors and her shipping was very reasonable which more than made up for the hardware being a bit more.
I actually enjoyed the sewing part. My machine is from 1974 (and avocado green!) and can be a little stubborn but it did just fine going through the ribbon and the webbing.