Sashiko projects are still fairly scarce, there are very few designers, but that is changing as it becomes more popular. Alderspring Design and Sylvia Pippen are the two main collections and both have a few Kits available. Here are a few of them:
Gingko Leaf Circle Cushion Cover Kit
Sashiko Stitched Clasp Purse
The Dragonfly Kit Series of Table Mat Kits
There is one more of theses, Dragonfly Above Diamond Waves.
There are several of these preprinted designs by Sylvia Pippen. Nice because you get to skip the transfer part and go straight to the stitching.
And this most popular of Sylvia Pippens kits: Sashiko and Butterflies
There are more but I’ll leave them for another day,