Just FYI, Elvo does have this on the first page, the inquiry page. It's easy to miss and I think most are looking for it later on in the process. But it's there.

Mandatory Fees and Taxes

You'll be asked to pay the following charges at the hotel:

Resort fee: USD 31.41 per accommodation, per night
We have included all charges provided to us by the property. However, charges can vary, for example, based on length of stay or the room you book.