There are several outstanding store-bought jellies. I have categorized them by flavor.
Grape: You cant beat Welch's Grape Jelly. Cheap and delicious. This is the way grape jelly should taste.
Raspberry: For a great raspberry taste ( as opposed to red colored sugar) try Clearbrook Farms "Oregon Red Raspberry." They have achieved outstanding raspberry flavor in a jar. I have tried lots of raspberry jellies and all but two have been disappointing. This jelly is one of the two. This jelly is great.