On the most recent episode of the Land Podcast, one of the data scientists from Acre.com was on to present a land value report they had created for the Heartland (mostly Midwestern states). They present data for price per acre, per tillable acre, and per productivity index. You can download the report for free from their website, but you need to give them your email. This report mostly includes data relevant to tillable acres, but they do track recreation land on their website. Some of the more interesting things from the report is the presentation of price per productivity index trends across states and time.
As this type of data becomes more and more accessible, I would imagine finding good deals is going to be more and more difficult.
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