These are the sites of the churches you listed:
Russian True Orthodox Church (got its orders from the UAOC), they follow Julian Calendar and they're located in Puerto Plata and Jarabacoa:
http://iglesiaortodoxard.galeon.com/The problem is that I don't know if the site is updated. This is because I read somewhere that the parish in Puerto Plata was received by Michael Champion's group (a non-Canonical Ukrainian Church, not the UOC-USA).
You can cross the border to Haiti and find the ROCOR mission:
http://www.orthodoxhaiti.org/The EP had a priest in hait but some years ago he was excommunicated (don't know why).
The priest of St. George's OCA Church in Texas is Dominican, he might help you find a Church there if the links above are not correct:
www.stgeorgepantry.orgBest wishes
Juan