Go on the various "cruiser nets" and ask for folks with extra or no longer needed
charts. If you are in or around Ft. Lauderdale there is "used
parts and stuff" store called "Sailorman" on State Road 84. They have piles of old used charts and guide
books.
- - If you are using lapbook or computer navigaton systems that read the NOAA free download charts that solves your problems for the US Virgins/Puerto Rico and
Florida. For other areas you can
trade or beg, borrow older e-charts from other cruisers.