I've only seen the SAF Red at Meijer and a pound lasts me about a year (I favor small amounts of yeast and long leavening periods), so I don't remember the exact price. I know it's less than the KA Baker's Catalog (even before factoring in their high shipping), so I reckon it's about $4.
FWIW, I think the turnover varies considerably at different stores; the McHenry Meijer seemed to have considerably fresher stock than the Algonquin store earlier this year at least. Still, I find no degradation stored in an airtight container in my freezer.