How do you find the best deals on land or old farms

[Chris C]

I have a couple asking me if i can help them find some land atleast 50 acres that is at a good deal i have looked every way i know and any foreclosed things i have seen have just been single family homes in the city or something along those lines and not close to the acreage that they want, so my question is where should i look or what do i need to do to find these properties? thanks in advance