1 - Based on your site, you need a link from Showsteers.com, they just plain old send traffic.
2 - Your local Craigslist, it's amatuer but it's free and it works.
3 - If you are looking for other places, consider EDJE. The few sites I have seen the back end stats for that are linked in their directory get about 50 or so referals a month from them. Over a year that's worth it.
4 - Find the other ag sites that aren't absolutely saturated with links already.
5 - Exchange links with people you do business with. (you link to them, they link to you)
Get Google Analytics to see exactly where your traffic is coming from both in terms of which sites are sending it to you and where exactly the visitors are coming from (which state). Without it you are just guessing whether the traffic is coming from Showsteers.com, this site, or a range of others.