Want to buy a Katamari style Blueprint

I would like a blueprint that I can apply to one object in the level that rotates and other objects stick to it. Once those objects are ‘stuck’ they would become sticky and the ball would grow. Nothing too complex, I just need something simple, something I can play with the parameters of. I’m new to this forum and to UE4 for that matter, apologies if this isn’t the right place to ask. What is the going quote for blueprint development? I don’t need sole rights to this or anything - this is not for a commercial game. Any advice would be appreciated.