I typically see them in the $1 section of Michael's, but only closer to the actual holiday season. Do you need them right now?
Oriental Trading Company is one of my favorite sources for "stuff" - they have different stuff at different times of the year, but they seem to have something for any season year-round.
http://www.orientaltrading.com/ui/browse/processRequest.do?Ntx=mode%2bmatchallpartial&sp=true&Ntk=all&requestURI=viewEndecaCategory&tabId=1&Ns=GROSS_MARGIN|1&N=389292+71&No=0
http://www.orientaltrading.com/api/search?Ntt=mini+bucket
But there are other places:
http://search.ustoy.com/search?w=mini+bucket&submit.x=0&submit.y=0
Oriental Trading was going to be my suggestion as well. When I owned my children's party store- a make your own sundae shop (so cute!)-- I ordered from them ALL the time!
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