Definition of "priciest"

The San Juan market is Mexico City's most famous deli of exotic meats, where an adventurous shopper can hunt down hard-to-find critters […] . But the priciest items in the market aren't the armadillo steaks or even the bluefin tuna. That would be the frozen chicatanas – giant winged ants – at around $500 a kilo.

2013 July 26, Nick Miroff, “Mexico gets a taste for eating insects […] ”, in The Guardian Weekly‎, volume 189, number 7, page 32