Time for some tough love Davey-boy,
Someone on this board may know where you can get Lobster in LT for $10, but I doubt it. From the first post you made here, you have asked DR1 member to come up with miraculous solutions to problems of your own making. It all seems to be centered around the fact that you are
OBSESSED with the idea of going to Las Terrenas, one of the more inacessable tourists destinations in the DR, even though you have a very limited time. You actually booked a flight into Punta Cana, thinking you could get to Las Terrenas and back in 24 hours. When You realized this was ridiculous, you changed to SDQ, and allowed yourself 48 hours. Possible, but totally senseless!
People have tried to help. I even PM'd you with info on getting from SDQ to Las Terrenas when the moderators closed most of your threads because you were tieing up half the board with posts in multiple forums. Now you want $20 air conditioned hotel rooms in LT and $10 lobster. Do you realize how much you will be paying just in gas (at $4.50/gal) to get from SDQ to LT and back?
Here is my suggestion if you want to have a pleasant vacation, and you would do well to take it.
Forget Las Terrenas for now!!!
It makes absolutely no sense to go to the lengths you need to go for the time you have. It is a beautiful place, but in reality not that different from many others much more conveniently located.
When you get off the plane in SDQ you are less than a 15 minute drive from Boca Chica. There are lots of air conditioned hotel rooms for under $40. Try this link.
http://www.bocachicabeach.net/
Reserve a room. Most hotels there will provide free airport transfer for a 3 night stay, but since you only have 2, perhaps you can negotiate a good rate for this, or you can go ahead and rent a car, but save on the gas to LT. I would say that you will be as likely or moreso to get good, cheap seafood there as well. Boca Chica is sometimes maligned as "sleazy", but if you check the travel guides, you'll see a lot of the same things said about LT. The beach is beautiful and tranquil, and food and drinks are readily available, as are other "ammenities"
Have a relaxing 2 days and return home with a smile on your face. If you try what you are planning in LT, I'm afraid you will not only spend a lot more $, but will find it more an ordeal than a vacation.
Good luck!