Ask at the barber or salon for hair. It is a great addition to the compost. Small or even large restaurants may even save you coffee grounds as long as you are faithful to pick them up. I snagged a whole bag (garbage bag size) at a bakery not long ago, of egg shells. Someone was taking them to the dumpster as I drove in. It doesn't cost anything to ask. Most places are glad to not put so much into their trash, especially if they are limited on space. Get the horse manure now if it is available and spread it on. You don't need to wait until warmer weather.