platter for shiva
If it needs to be kosher your best options are the Knish Shoppe (dairy) and Goldberg's Bagels (dairy) or Accents Grill in the Greenspring Shopping Center (meat). If you want to bring baked goods your best bet is Goldman's Bakery (reisterstown Rd.). All of these places close early on Friday (and are crazy on Friday) and are closed on Saturday.
Avoid 7 Mile Market completely. The place is disgustingly dirty, and is an absolute zoo on Fridays. The only reason to go there is for the cultural experience of being in the center of the Orthodox pre-shabbat shopping frenzy.
If it doesn't need to be kosher, all of those other suggestions are good. You can also add on to that list Eddie's of Roland Park and Miller's Delicatessen in Greenspring Shopping Center.
2839 Smith Ave, Baltimore, MD 21209
508 Reisterstown Rd, Pikesville, MD 21208