Noosite is definitely a good place to start, but it's often a bit out of date. For instance, it quotes a $20 EC fee for St Kitts
. I'm charged $30 EC when I clear in. $EC is Eastern Caribbean
dollar ($2.70 EC = $1.00 US).
Chris Doyle's sailing guides are the standard for most cruisers in the Leewards and Windwards, and are updated every other year.
Most of the British heritage islands charge about $30-40 EC, depending on boat size. That's $11-15 US. BVI is more, but most say it's worth it. If you want to stay in the BVI for several months, $300 US buys you a year's stay. French St Martin
is $7 US.
Really, after considering the expenses you've incurred in just getting to the islands, don't let the entry fees dictate where you go. Each island is unique and worth visiting.