Alumaluster is $180 for 8oz which is enough to do at least three of these helmets. It goes a long way.
Bobamaker - $360
Alumaluster - $180
Clear coat - can be a $20 can or my favorite, Matrix clear coat, which can be bought for $78 shipped.
You’ll find that is still under $700. Switch to a 2K rattle can and you’d be under $600. If I’m not mistaken, Sam sells, (or at least sold,) 4oz kits of Alumaluster as well. That would be more than enough for one helmet, if someone desired to go that way. That would reduce the price even more.
I am speaking from first hand experience here. I use these materials regularly, and I have for years. I am familiar with the costs and options. If there is anything else that needs to be cleared up, by all means, let me know.