Chef-owner Derek Davis, who's been in Manayunk pretty much since the neighborhood hit the culinary map nearly 15 years ago (he now has Derek's), is venturing into Ardmore with Main Line Prime, an old-time butcher shop, due to open mid-month. Main Line Prime (in Ardmore Plaza at 18 Greenfield Ave. off of Lancaster Ave.) will sell dry-aged beef, plus Jamison Farms lamb, pork, veal, chicken, fish and shellfish and some specialty foods. Davis is no stranger to beef; for 10 years, until January 2004, Davis owned Kansas City Prime, one of the city's few independent, high-end steakhouses. The beef will be from Charolais cattle, sourced by Bernard Loke of wholesale butcher Ashley Foods, which sourced KCP's beef. He'll also sell real Japanese Kobe beef. Home delivery, too.