The "strip" holds 8 items max on each side, and different items
are on each side. The vendor only services the store every 3 weeks in my area, so if 8 sales per store every 21 days is great for you, so be it. These items also have a 50% markup, so if they are selling at $6.99, the company is selling these hot selling sponges to this vendor at a very low profit margin.
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Considering SpongeBob was sold out--who cares who stocks the products. Given the results of the SpongeBob demand, I'd guess the jobber will put even more strings in even more stores.