Used farm equipment can be purchased at farm auctions, through farm equipment dealers (especially tractors), or found through website listings such as Craigslist or tractorhouse.com. For tractors, combines or other powered equipment the number of hours on the unit is a consideration.
No problem, Beth! A general rule to follow for a follow-up email to an application is to send it between three to five days after you submit the application. You want to give them enough time to receive and possibly review your information.
The first form of following up is actually sending a thank you note to your interviewer. This should be done immediately after your interview (related post on sending thank you notes here). I recommend sending the thank you note (follow up #1) the day of the interview or the day after.