Not routinely, though they often carry a lot of one-time-only stuff. If you're looking for that sort of a duster without going to a janitorial supply store, try Smart & Final. I just have a cleaning service they were great for many of my needs.
Smart and final is your best bet, was at Costco last weak and they didn't have anything like that. You can call customer service and ask if they got something in.
Every Costco may have different items. I would take the advice of several people suggesting you call the store. You could also go online to their corporate website and order if it is available online for shipment to you.
Seasonally... best to call and ask...
Yes
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