The Original was $1.29, while the other two were $1.49 a piece at my local Sonic, but I received these courtesy of Sonic.
The Original comes with mustard and ketchup; the Chili Cheese comes with chili and shredded cheddar cheese; and the Baja Jalapeno & Chili features chili, a spicy cheese sauce, and jalapenos.
Overall, Sonic Lil' Doggies are pretty enjoyable if you like their regular hot dog flavors. I didn't much care for the spicy cheese sauce on the Baja Jalapeno & Chili version, though, and would have been pleased if it just came topped with warm nacho cheese and jalapenos. For the other two flavors, it really comes down to whether you want a mini hot dog for $1.29 to $1.49 or a regular-sized hot dog for $2 or so. Although, like the Lil' Chickies, the mini version let you grab a bit more variety without filling up too much.
Nutritional Info - Sonic Lil' Doggie - Original (89g)
Calories - 210 (from Fat - 90)
Fat - 10g (Saturated Fat - 2.5g)
Sodium - 890mg
Carbs - 19g (Sugar - 4g)
Protein - 10g
Nutritional Info - Sonic Lil' Doggie - Chili Cheese (97g)
Calories - 240 (from Fat - 120)
Fat - 14g (Saturated Fat - 5g)
Sodium - 930mg
Carbs - 18g (Sugar - 2g)
Protein - 12g
Nutritional Info - Sonic Lil' Doggie - Baja Jalapeno & Chili (104g)
Calories - 260 (from Fat - 140)
Fat - 16g (Saturated Fat - 4g)
Sodium - 970mg
Carbs - 18g (Sugar - 3g)
Protein - 11g