Here is the site.... craigslist classifieds: jobs, housing, personals, for sale, services, community, events, forums
1) Click on your state if you live in the US, or click on where ever else you may live
2) then it may ask you to click on your nearest city
3)then under the topic "for sale" click Farm+Garden
4) at the top of the page, you can narrow your search by typing in what exactly you are looking for, or just look at the listed sales/offers.
I really hope this helped you out. If it didnt please tell me what you still need help with.