I am a big Cozumel guy, so I figured I would put a few tricks to reducing the cost of that experience... here goes
1. Obtain a Southwest credit card and use it to get points... they have a very rich and affordable program
2. Fly into Cancun and take the ADO bus to playa del carmen $12
4. Take the ferry from playa to Cozumel...and your there
5. Book 60 days out, it’s typically the cheapest time.
6. Try Scuba club Cozumel in late September ... great deals
Costco also has some great deals, definitely worth a look.