Congrats Maisy and welcome to the forum! I'm sure you'll get a wide range of numbers from people on here. All inclusive resorts will definitley help you save money. The big difference on locations costs for Cuba vs. DR will be flights. When it comes to the rest of your wedding details, there are always ways to find things a bit more affordable. For photographers, there are a few of us on here that are still fairly new to the DW end and as long as expenses are covered they won't charge much else. That might be a more cost effective option than booking a local vendor.
Best of luck with the wedding plans!