Today (through 11/17) you can take your old Christmas lights into your local Home Depot to get up to $5 off a new LED Light String purchase.
The fine print: Valid 11/7/13 through 11/17/13 and redeemable for a $3 Off Home Accent Holiday LED Lights, $4 Off Martha Stewart Living LED and GE LED Lights, or $5 Off Eco Smart LED and Lightshow Lights. Valid only on single receipt in-store purchase of LED lights. Receive the discount for each string recycled (limit 5 discounts per customer). Available at participating continental U.S, Hawaii, Alaska, Guam, P.R. and U.S.V.I The Home Depot stores. Offer not valid on (a) prior purchases or (b) purchases from any The Home Depot affiliate store. Offer may not be combined with any other offer, promotion or special incentive program or used as payment on any The Home Depot credit account. No credit if offer refused. Cash value 1/20th of 1 cent. Present to cashier at time of purchase to receive your discount. Void if sold, copied or transferred and where prohibited.