Computers should only pay ITBIS 16%, I believe they have 0% import duties. I have never been charged any import duties for brining in computers, only ITBIS.
If you're in Santo Domingo, take a look at Omega Tech (John F Kennedy -
Map), they are the largest wholesaler in the DR. They usually hold around 500 laptops in stock at any one time. They have a massive range of inventory.
The owners name is Alvin, real cool guy and fluent in English. He spent years in the computer business in Miami.
Their pricing is very good, some items I get cheaper than I can buy from Amazon!
e.g.
AZB picked up a 100" ceiling mounted projector screen for RD$3,000 (US$80). This was RD$6,000 cheaper than the price at the local RadioShack and cheaper than the USA.