Where do you live? There are many local Christmas lights groups across the country that typically will have little expos and conferences during the summer. They will usually all go into together to put together a big bulk order to get good pricing. Then they pick their orders up at the conference.
Typically the orders go in during Feb or March, but some do go later. Often the vendors will bring extra to sell and if you contact them before the show you can cut a better deal.
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