We pass the cost of shipping on to the customer.
For large orders its UPS or Fedex if it won't fit in any USPS flat rate box. Usually I can fit 10 on average in a Flat Rate Box. I think its $12 or $13 to ship that way, UPS and FedEx are typical around $15 - $20 on average.
Single shirts go in a USPS flat Rate envelope for $5, you can go Parcel Post or First Class envelope even cheaper.
Unless your a very large company doing hundreds of thousands in shipping every year, UPS and Fedex aren't going to make deals with you I don't think.
For large orders its UPS or Fedex if it won't fit in any USPS flat rate box. Usually I can fit 10 on average in a Flat Rate Box. I think its $12 or $13 to ship that way, UPS and FedEx are typical around $15 - $20 on average.
Single shirts go in a USPS flat Rate envelope for $5, you can go Parcel Post or First Class envelope even cheaper.
Unless your a very large company doing hundreds of thousands in shipping every year, UPS and Fedex aren't going to make deals with you I don't think.