I picked one up for $2.25.
Between the beef, cheese, and lettuce, the Bun Taco got pretty messy with everything except the lone tomato slice seeking to escape the bun. The best way to go might be to use the wrapper as a cradle to keep everything nice and tight while you slowly pull it back with each bite.
The bun is very squishy and soft; perhaps overly so.
Nutritional info not available.