Hey bud, I think you should raise your shipping a little bit. Most of these teams will cost much more to ship - yankees and USA will be flat rate.
Might combine a few teams too. Oakland and I think Astros and/or indians have few cards if memory serves.
Just my advice. I love this product! Trout prospect cards and autos to Strasburg patch autos... great product.
Ustream - http://blowouttv.com/blowout-tv-with-host-houdini/
Vaughn - http://blowouttv.com/houdini-on-vaughn/