Here's Emory's estimated costs:
http://med.emory.edu/admissions/financialaid.cfm
Housing is listed at $23,664. Food may be included in this because it's not listed elsewhere.
Here's UPenn's estimated costs:
http://www.med.upenn.edu/admiss/financial.html
Housing is listed at $10,670. I don't know if that's on or off-campus. With their food budget, cost of living would be between $15-16,000. That's still significantly cheaper than $23k. I'm not looking to put one above the other, I'm just curious as to why there's such a difference. Of course, if Emory is planning on putting all their students in Atlanta penthouse suites, I'm totally ok with that.
Also, thanks SodaScientist. Good to know!