To my knowledge, the answers are:
1. Yes, there is a volume discount
2. Every company has different lines (some more than others) that range in price according to the quality of the fabric and styling elements.
3. The kits are generally purchased through a local retailer, at prices governed by multi-year agreements with the supplier. I assume the retailers' margins vary but are below normal retail.
4. I doubt that clubs use uniform purchases as a profit center, but can't swear to it.
