Check IKEA online. That will tell you if it's available in store
They have a spare parts section by the returns desk with all kinds of random stuff like that.
Go to Home Depot.
I agree with Melissa -- I've never seen anything that looks like wood dowels in the store and there's no mention of them in the catalog.
I don't remember seeing them there, however there is a craft store next door that would probably have them
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