The 4/12 rp has a $3 off coupon and here’s a $5 off any size Insync product printable.  I think the dates on these were 2016.

6/21 rp has a 50¢ coupon, in case you’re running low (from the Walmart  – or even Menard – freebies).

No coupons out, but a darned good price even without – these go for $7.86 a box at Walmart. The ones pictured had 5/2016 dates.