I just bought a condo in a resort near the beach, which is valued at $300K, for $200.

A big agent player in this space is going to do 100x the volume of the unlicensed wholesaler types.

I can make this happen from pulling from some retirement investments and a HELOC, but these seem like the last resort as it would hinder further deals.

Starting out I strongly recommend buying a performing note so you understand the process and players.

I've recently been turned onto this 'Resort Condo' through our lender that owns 2 of his own. 

Best way to pierce into Austin as a newbie is to network with other big players and top brokers. join as a LP on a deal to learn it while building your portfolio. if you want a place thats hot but less espensive then north dallas ftworth.. if you want great value add we can help you here in san antonio

We are about to finish an identical property next door to this one and rent it to more baseball players.

So far I like Festival and Soltara because I can have a small private plunge pool in the lanai plus the resort pools. 

My strain of thought is - when the big players buy lands in the millions and the construction go in the tens of millions I'm sure someone lend them money for both land and construction, is there any solution for a he little guy ?

Giving up your house is self-defeating and should be a last resort option.