Definitely add me to the 'please add a cart system' list. It would take some work to figure out the logistics of coupon application to single items, but surely it can be done.
I've taken to only using gift cards for purchases in the meantime to avoid several smaller charges on my CC.
Kobo is an Airmiles affiliate in Canada, and since I pretty much only buy fiction, my individual purchases are
never over $20, the amount needed to earn one airmile.