No suggestions, other than the obvious .... google around LQS', Amazon, eBay, etc.
I know there is one company that makes a lot of bag patterns and also sells all the required hardware. But sorry, I have no clue what the name of it is.
More so, I feel for you and am just shaking my head at your LQS and others that offer a class,
but then do not have the supplies required.
Totally inept and irresponsible .... yes, JIMHO.
Just seems so wrong.
To be quite frank, no matter how much I wanted to make the bag (or a different class project),
I think I would boycott their class, when they did not sell the required parts or that it was not locally available. Again ... JIMHO!