Where can I buy transfer paper to print stuff on and then iron it onto my shirt? -

Also, will the iron ons withstand being washed?

You can get iron ones from any craft store. I would try Office Max, Wall mart, or Target. They all worked pretty well, you just make sure that you read the directions, to get the best wash with it.

Any large Office supply store Staples, Office Max, etc. If you follow instuctions properly it can be washed.