 So, should you order ahead in the McDonald's app? That depends. Do you like skipping lines? Do you like staying comfortable on your couch? And finally, do you like free McDonald's? Okay, we should have led to that one. Now, when you order in the McDonald's app, you can get any breakfast sandwich for only $2, available only in the app. Valid once per day through 1231, and participating McDonald's must opt into rewards, excludes tax.