Spirit Air also has some great flight deals; and has direct flights from Orlando to San Juan, so you can bypass Miami. If you join their $9 club - a one time $39 fee - it will get you some amazing discount prices when they have their frequent air fare sales; you will save much more than the $39 the first time you fly with them. We have had great results from this airline.
www.spiritair.com They do not sell through orbitz, etc - like Southwest, you have to buy at Spirit Air's website.