For some reason, in my area, pumpkins are not a problem, because, in addition to Halloween, a lot of the folks around here use them for Thanksgiving decor. There's a farm just outside Joliet that sells huge pumpkins, which is where I shop for my Halloween pumpkins, but I have a carved jack o'lantern in the house through all of October.
As for shopping on line, you can pretty much find anything for sale at any time of the year, be it Halloween decorations of Advent Candles. Yes, I actualy do order Advent Candles in July, because if I wait until Fall, they won't arrive until after the first Sunday of Advent. And for some reason, pink and purple candles are as rare as hens teeth in this area.