Thanks for this, had heard about it once before, but timing here was perfect. Read at 4:20p, grocery store 10 min later, and made it to the post office by 4:55p. Mailed a yam to a friend in MT postmarked with her bday today. From SD California for a nearly 2lbs spud cost $16 for priority with tracking. 8x the cost of the potato itself but worth it for the pun potential.