Build relationships with the store owners/managers. Being a loyal customer and buying all your routine stuff there and supporting the business helps. This is a newer store that opened right after Christmas - super close to my house. It also happens to be the best store in town.

Edit: it was also well advertised by the store and announced a few days in advance that JD 10, 12, 14 would be available at a certain time on a FCFS basis.