If you can order it that store has some great prices shipped (60 discs 1/4" x 1/16" for $14 shipped). Sweet, I like the ones I have in that size.
I don't know why they would be any weaker, the "Super Magnets" are made out of Neodymium too. Maybe it varies from company to company. *edit-Different composite*
I ended up calling my closest Ace and they did not stock the above part. The SKU is 2102275. He looked it up and two other stores locally stock it. He offered to have it ordered and delivered to that store too.