Hop pellets don't need to stay cold. If you want to store them at home for a while, put them in the freezer, but shipping isn't an issue. Liquid yeast is what may require cooling. During warm weather months, you can pay for them to be shipped with a cold pack, and even then you need to figure out timing so as not to have them stuck at UPS over the weekend. Or you can just order dry until the weather cools down.
Liquid yeast can be chilled, just warm it to room temp before using.