If you are looking for cheap airfare, I just booked round-trip into Cancun for $363 out of LAX on Continental for my trip in August. Leave on a Friday, return on a Saturday. Try some variation of days to get the best price.
From Cancun, you could take a shuttle to Playa and then the ferry to get to Cozumel. Much cheaper than the airfare into Cozumel was.
From Cancun, you could take a shuttle to Playa and then the ferry to get to Cozumel. Much cheaper than the airfare into Cozumel was.