JULIE -- This is a very cute collection. Looks like fun to stitch. How are you planning on finishing the group? One large unit -- like a wall hanging> Individual pieces to frame or make pillows. Making names for your kids rooms?
Yes, it will be a big expense. You could wait for a sale and bu a couple at a time. You would run the risk that the group could be discontinued.
Are you going to stitch everything on the exact same color fabric. If so, figure out how much fabric you need and buy fabric by the yard. NOTE: These patterns are not uniform in size.
I probably don't have to tell you this. Don't buy the floss individually for each piece.
Good luck.