Playing with the MLS, as you put it, is not possible until you are a member. I guessed from you post that you are licensed but awaiting some brokerage training to start.
Palm Beach county does have a great website known as PAPA that is the Property Appraiser's Public Access site. It shows sales and can be searched by date or address etc.
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Broker-Owner Thirteen Years REO Experience
GRI,CRS,CRB,e-Pro
Some days I feel like the bug, other days I feel like the windshield