Where can I buy chestnuts?

I have heard chestnuts keep spiders away but I was told they are not in season right now (only winter months). Still, there has to be a place to buy them here in the states. If someone knows, can you recommend a good place? Or if not, is there a less expensive alternative to buying the chest nuts from another country? I am open to other suggestions on keeping the bugs/insects away from the house, spiders esp. Any info would be greatly appreciated. Thanks!