The Local Craft Store carries Midwest Products, I never saw "12 Packs" The store has a set of shelves, with dividers with the different size wood products, but individual pieces. So, would go and grab an assortment of pieces, depending on what project I was working on, like cutting Track Ties, or need wood for scratchbuilding. I have several cardboard tubes under my bench work with an assortment of basswood and some balsa. Also, the flat 3" wide sheets. So, when I get an idea for a project, I got some inventory to look through.
I'll go check that out at my LHS.