Originally Posted by feline fanatic

I found these but it is a kit. The last two are the closest description to what you are looking for and I'm not 100% positive the cores are precut on that one from Fons and Porter

https://www.amazon.com/Runner-Precut.../dp/B015BVWS8E
https://www.amazon.com/Patriotic-Qui.../dp/B01EM0P7S8
http://www.quiltkitsandquarters.com/product/prec-qk-ac
http://www.shopfonsandporter.com/pro...cut-quilt-kits