I got both of these chips several years ago and paid close to $100 each. The Sheraton chips seems to be offered more frequently now and you could probably buy one in the $50-75 range. The Caribe Hilton is still a very scarce chip unless a quantity has turned up in the last few months. That is always a risk in the Caribbean specialty, especially when it comes to Puerto Rico chips.
There are several other Caribbean collectors on the bb and hopefully you will get input from them as well. Archie Black wrote the price guide on Puerto Rico chips.