I need to take ONE Upper Division ECON class online to Graduate

I currently go to Montana State University and this is the course description

ECNS 301. Intermediate Micro with Calc. 3 Credits. (3 Lec) F,S
PREREQUISITE: ECNS 204 or ECNS 251, M 161 or M 171. A study of microeconomic theory and selected applications with emphasis on theory of consumer behavior and theory of the firm. A major objective of the course is to prepare students for additional upper-division courses in economics.