Today only, Target offers the Play-Doh 24-Can Fridge Pack for $7.49 with free shipping. That's $0.31 per can. Sales tax is added where applicable. This set includes 24 assorted colors.
If you need it for Christmas, your local Target retail store may have it in stock. (Click "Find it in Store" and enter your ZIP code for more information.) Note, however, that it may also be a good idea to call your nearest store to confirm stock before you make the trip. It's only in stores in my area!