If you're buying in bulk, you can usually get good prices on printed t-shirts from your local screen printer (or a screen printer online).
Some things to remember to keep costs down on screen printing (especially for giveaway t-shirts) are:
The more you buy, the less it costs per shirt.
White t-shirts are less expensive than colored shirts.
The less number of colors you print, the less expensive your print job will be.
The less print locations you print, the less expensive your print job will be.
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