Can't find solid color t-shirts to screenprint on

I am a crafty teenager who's mom has been driving all around Old Quarter trying to find some decent blank tees to screenprint with. Most shirts we find are thin and see-through. I don't want to spend too much, probably max of $3.
Please give me any suggestions!
Thanks :)

In theory, most lighter weight fabrics cost more, so opaque, heavyweight t shirts are cheaper. If you want to buy t shirts at $3 you probably have to buy bulk because that's almost the cost of an average t shirt. I don't know if there is an equivalent of Saigon Square in Hanoi, where you can find factory surplus, but if not, try Lime Orange or Ginkgo.

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