McDonald's. The popular limited-time item features a formed ground pork patty (shaped to vaguely resemble a mini rack of ribs) slathered in barbecue sauce and complemented by slivered onions and pickles on a long cornmeal-dusted roll.
It's selling for $3.19 in the Los Angeles area (may vary).
Select markets are offering a deal where you can get a second McRib for an additional $1 when you purchase a McRib Extra Value Meal (which is $5.29 at my local McDonald's).
The price has gone up a little bit since three years ago when I first tried the McRib. It was only $2.69 back then.
You can expect the McRib to stick around until the end of the year.
Update: 11/20/13: It's not a nationwide launch this year (but appears to be available in most markets). It's up to franchisees to choose whether or not they're selling it.
Nutritional Info - McDonald's McRib - 7.3 oz (208g)
Calories - 500 (from Fat - 240)
Fat - 26g (Saturated Fat - 10g)
Sodium - 980mg
Carbs - 44g (Sugar - 11g)
Protein - 22g