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If you have a lot of soil and have nowhere for it to go (for instance, you already used some to amend your plant beds but you have quite a bit of soil left), there are probably others in your neighbourhood who could use it for their own landscaping projects. Putting an ad up somewhere like Craigslist is your best bet. There are obviously no guarantees whether someone will respond to your ad, but it is a way to get rid of your soil for free, all the while helping out a stranger while you're at it.