I registered with JetPack yesterday [13 June 2016]
Their price per pound is 164 pesos, compared with 184 at CPS Sosua.
The receptionist does not speak English but she called out the manager(?) or owner(?), Alexandra Quezada, who speaks excellent English and was very charming.
Their address is in Avenida Manolo Tavarez Justo, on the north side, going up the slope towards the Hospital. They are directly opposite the large, single story, PLD purple and yellow building.
From the Stadium, proceed up the hill past the main entrance to Torre Alta (Calle J.A Puig) on the other side of the dual carriageway. They are 50 yards further on.