My local Jack in the Box have them at $1.29 for five pieces.
Update: 12/21/12: Jack is also doing a promotion where, similar to McDonald's, you can get 20 nuggets for $4.99.
Jack's Chicken Nuggets are a bit of a keeping-up-with-the-Jones addition to the menu. A "Yes, we have chicken nuggets" type of deal.
They are most similar to Wendy's Chicken Nuggets which, in turn, are similar to the frozen ones you buy at the supermarket.
The flavor is almost overly salty, but fairly neutral otherwise which makes them ideal for dipping in sauce. I tried the barbecue sauce with them and they went well together.
Breaded nuggets aren't my preference, but this version is done well and make a welcome addition to the random cravings available on the Jack in the Box menu.
Nutritional Info - Jack in the Box Chicken Nuggets - 6 piece (not sure why they list 6 pieces when they sell them in 5 pieces)
Calories - 240 (from Fat - 150)
Fat - 17g (Saturated Fat - 2g)
Sodium - 600mg
Carbs - 13g (Sugar - 0g)
Protein - 9g