From FW:

Subway-April 10th-Customer Appreciation B1G1 Sub Day!!
On April 10th, subway will be offering Buy 1 Get 1 subs. It is going to be their customer appreciation event.

This includes all subs including premium subs and also subs will double meat, cheese, and bacon.

They will be advertising soon and will be at all if not most subway locations.

Enjoy!