A box of food when on sale (special occasion like Christmas, Mother's day. Independence day) is about 70 dollars.
Used clothes is a little bit more. New clothes is more than double.
The shipping co. provides the box, but charge you 6 dollars when you pick it up or when they deliver it, then you can deduct it when they pick up the full box. It's called puerta a puerta.
My brother send boxes with food every time to his family in Tenares. He was paying extra money to put on the side 100lbs bag of rice and big container of oil, but now they are going to restrict the rice because people who sell rice in DR are complaining. Rice is not selling as before. Now what he does is he pours the full 100lb of rice in the box.
People prepare the boxes and seal them, then when the shipping co. come to pick up the box they will ask you what is inside you tell them food and pay for the food price.
Last year a friend put a small TV in a box, the container was randomly scanned, TV was found. He had to pay I think $75.00 extra for the TV.
This is on your own risk. Maybe you will never get caught.
Another friend sent a box with Christmas goodies, her familiy received the box in April because that particular container was scanned in Florida but nothing was missing.