Amalie carries newer Jeeps, soft tops I don't know about. Most rental agencies have stopped carrying soft top Jeeps with removable tops because of damage caused when renters get stuck in a brief but typical downpour and scramble to get the top back up and on. For the same reason most of the factory-installed removable hard-tops are locked in place. You could try Dependable or Discount too.
This is a travel forum but what do you need help with? You can keep an eye on the classified ad section on this site, check the Daily News, Island Trader, craigslist, The Avis if you're on St Croix - and check with used car dealerships. Place an ad on the classified section here (see "Forum List" top left this page).