Have you spoken with the shop about the products? If they are showing up as out of stock they most likely have enough set aside for the class participants that will be available that day. That's how our workshops go.
Two weeks ago I took a class on precision piecing and we used a glue type product (not elmers, not Roxane's, something much lighter that was great for an adhesive as we didn't use pins!). Also we used a product that relaxed the fold to help it lay flatter after pressing. It really helped as every little bit in the process affect how precise your block is.
Our workshop was all weekend and I nearly, yes nearly, finished one 6 inch block. Future blocks of course won't take as long but we really went over every step and practised. I was very pleased with it and the products we used (all available on the day) and can't wait to incorporate it into my sewing habits.