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.