CDs with lables that make them look like old vinyl records . You could also set up an old RECORD PLAYER and have REAL VINYL records for guests to play. Ooooh, perhaps even give the records as Wedding favors?
Mason jars as drink glasses for the evening and they are a simple keep sake. Guests could fill at the end of the night with favors of choice ( candles, candy.etc ) I LOVE this idea! I'm sure it would be pretty cheap too!