Rjonsun is correct. If you feel comfortable bargaining, by all means go for it and you should find someone willing to do it for $100. Bare in mind that not every driver knows how to get to TB and I've heard of horror stories of folks getting lost. OneStop is $110 each way and you can arrange to have a cold case of beer waiting on board. I've found prices for booze to be cheaper in Black River than at MoBay's Mega Mart (but not as much variety if you want only American booze) and often the money exchange is better too. The main road along the water ends just as you enter the main drag of Black River, with only a left turn possible. Have your driver park and walk into the supermarket a few buildings away. You can buy supplies and change money at the cambio inside. There are several supermarkets to chose from; all are competitive. If you are only buying booze, the store right at the turn sells beer, wine and booze. A block up the driver makes a right and you have to drive through the public market where you can also buy things you need. It's easy to get a route taxi both ways to Black River from TB but the fairly modern supermarket in Crossroads just past the police is much closer.