You've heard of Groupon, right? (If not, go here to check out great deals in the Sioux Falls area...sign up and you'll get the daily deal delivered right to your inbox or visit the site daily).
Here are a couple of other local daily deal options for you (sign up and they'll be sent to your inbox daily, or visit the sites daily to check them out):
Keloland Spotlight: Go here to check it out
Argus Leader Deals4All: Go here to check it out