Need ASAP, Kosher Deli near Rivervale NJ 4 Shiva
I don't know if either would deliver to Rivervale (although it's certainly possible), but there are two excellent kosher delis in Bergen County:
Petak's in Fair Lawn - (201) 797-5010
Kosher Nosh in Glen Rock - (201) 445-1186
They're not cheap, but both are excellent quality. They're about a mile and a half away from each other, and about 12 or 13 miles away from Rivervale. Montvale is a few miles further away.