I didn't see this posted so I would share:
They had an email on Thursday, Jan 19th, titled "FREE Your Choice 32GB Flash Drive/SD/Micro SD – Print Your Coupon Now" See attached screenshot. This email went into my spam folder so I didn't notice it till this morning.
Click on the link in the email to print your coupon. It has a barcode with your email address
Coupon expires on Feb 5th so you do have plenty of time to act.