One of the best lessons to learn is to never buy something that is not **exactly** what you need or want, or at least the very-closest possible alternate or substitute. It's a lesson I've been teaching my young son for several years now; if we go to a store looking for a product, and the store does not have exactly what we want, we do NOT buy "something, anything", just to satisfy some shopping impulse...we leave with the money we came in with. In the long run, in today's world of diminished retail inventory and just-in-time restocking, it's often a better idea to shop on-line and order a product off the world wide web, and then to make 100% sure the product is AT the store...before going to the store and picking up the merchandise.
Secondly...when shopping at retail for specialty products, it's not smart to expect to be able to find specialty products at warehouse discount stores, or grocery stores,etc..