Now through February 24th, you can take advantage of this rebate valid for a FREE Alka-Seltzer Plus Cough & Mucus DM! Simply purchase them at any store and follow the instructions here. There is a limit of one rebate per household. The check will be mailed out to you within 8-10 weeks! Purchase must be made by February 24th, but you’ve got until March 10th to submit the rebate.