I think that studying supercarros.com in depth will give you a necessary "feel" for what's generally available and what the current ASKING prices are on the street, BEFORE you take your money to it (the street or any particular dealer).
Keep in mind that Dominicans are used to haggling even over the price of a single sanitary pad at the local colmado. Car dealer tend to try to play a sort of price "authority" first, but at the end of the day they are not likely to see you WALK off their lot. If you don't speak Spanish well enough, bring a trusted soul who can along. And TAKE TIME. You got the money, they want it.
Check back with the dealerships to see if the particular model can be serviced locally (nope, some imports are not designed four the local low grade fuels, some have new type automatic gear boxes for which it is almost impossible to get the power fluid, and so forth.). Also check on the NEW price locally before buying an almost new vehicle (1 to 2 years), you may be surprised to find out that some dealers will try to sell you something used for more than you could get it new.
IF the vehicle is a Dominican issue (local dealership original), check with them about the service record and IF the warranty is indeed transferable and active (some are not anymore, even though the vehicle is well within the warranty time and mileage, just because the services have not been done at the dealership up to the schedule!).
CarFax is a valuable tool, but only for cars that HAVE BEEN registered in the US and only for that time.
And finally, where ever you or the vehicle in question may come from or what currency you are paying with, this is the Dominican Republic and only this country's laws will apply to the deal (especially US-Americans seem at times to have a hard time to adapt to that fact).
... J-D.