Just going to add a bit to what Lakeside said about the importance of the money.
You can bring as much money in as needed but "You Must" declare exactly the amount you are bringing in. That includes the money you will be spending on food, hotels, gas etc. If you are spending let's say 12K on your TT then you need to declare that and the other amount in your pocket. If you do not abide by this it is possible if caught you will lose all your money or TT. Don't worry, just be honest and you will have no problems.
I am also curious as to what you are buying here. Normally it is Canadians buying in the US.