Without working with the conventional agent, what other ways can I identify apartment's and reach out to the ownership, the quickest?

However, with very low housing inventory in this price range, it may appreciate at a much higher rate.

@Marc Woodward nothing like a red hot market and a lack of inventory to the rescue. 

I'm personally going to be house hacking my first duplex using either a FHA or conventional loan within the next 6 months, depending on the deal I can get.

Hot market why would a realtor do anything but sell through normal channelsin a market  with an over abundance of inventory and slow sales times then like the OP said they will take anyone who may be able to sell a listing for them.

I just did a quick google search & wound up on Fannie Mae's web site, which states a seasoning period of 6 months for conventional loans.

It is still conventionally reinforced versus post tensioning.

By Florida law, all debt, assets etc have to be listed either in 'inventory' or stated as a claim on estate in probate.

Even under a (wholesale) contract, a conventional buyer doesn't work due to Seasoning?

The problem here, is that I don't have enough money for downpayment(conventional loan) for duplex and may need to wait for another 6-9 months to do that.