Wherever you decide to source your compost today, you should also commit today to making your own. That way next year or the year after, you will have your own. I started 4 years ago, and only started growing organically a year ago, so had a windfall of compost. First of its fun, second its the best for your garden and plants, and its the right thing to do with your kitchen waste, and its cheaper than buying, and using your own compost from your own waste to grow amazing smoke is just so much rewarding.