In honor of National Cheesesteak Day (yeah, supposedly that’s a thing) you can get up to $15* off on the  Rock ‘n’ Roll Philadelphia Half Marathon.

When you register by 3/25, use the code “CHEESY” for the discount. But the code expires tonight, so hurry!

*Save $10 on the half marathon with code CHEESY and an additional $5 by beating the 3/31 price increase. Online code CHEESY is valid for the half marathon only and expires on March 25 at 11:59pm PDT.