I just saw this on the Target Daily Deals page:
Daily Deals text alerts have their perks. Text DD to 827438 to start getting alerts daily, and get an exclusive mobile in-store coupon this Saturday, valid through Sunday, 10/14.
No clue what kind of coupon it will be but it might be worth signing up for if you have unlimited texts!
Target also sends out mobile coupons when you sign up here – they are usually pretty decent and they release ones for everything from food to toys to clothing to sporting goods.