Yes, I've been told life insurance is offered in the DR.
How expensive would be determined by the type of policy you choose. In general, due to shorter life expectancy, Life Insurance should be more expensive than similar policies sold in the US.
You are probably better off buying Life Insurance in the US/Canada. You don't need to live there to have them issue a policy. Additionally, I would doubt if there is any guarantee fund in the DR as there is in the US (and presumably Canada).