ArtsCow have the same size of Shutterfly
and I made these cute little calendar magnets (like fridge magnets) but I don't remember where...
And I know MyPicTales have several sizes of calendars, but haven't try them yet
I do mine every year through Costco. I design my toppers 4x6 size and just use thier standard calendar. There is a white border all the way around the design on the top- but I actually think they look really great and at 9.99 ea very affordable