You don't really need to purchase a template, you can make your own. I generally find a round object, glass, cup, saucer, plastic lid from butter, get the idea. Use that to either mark directly on the quilt top or use it to make a template with several curves on it. Favorite is the plastic lids as i can mark on them or cut to make a registration or other mark to line it up.
Lovely quilt you have made.