being in San Antonio, you might consider using that $ to cover most of the cost of a weekend liveaboard trip to the Texas Flower Gardens (FLING or SPREE). It's an relatively undiscovered very pristine dive site in your own backyard (road trip), where you can make new local dive buddies, gain awesome real world experience.
Most dive ops/liveaboards who ask you about your dive experience, if you tell them you dive the Flower Gardens, they have immediate respect for you...it's considered 'big boy' diving...and you will gain far more usable/real world diving experience than taking any number of classes in your local pool/quarry....plus, again, it's awesome diving!
(the Texas Flower Gardens are the only place I've ever seen Whale Sharks, and only the 2nd place where I've ever seen Giant Mantas!)