There several factors that affect the price of a Tee....
Printing in full color  (fewer colors cost less)
The color of the fabric (white tees cost less)
The sizes (Larger sizes cost more)
The quantities (The more you purchase the less each costs, Min 50)

Blue
There are No 3X
3 - XX
 7- X
5 - L
5 - M
4 - S

Front and Back - $400
Front Only   - $325
Shipping included

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Plain White
1-3X
3 - XX
 7- X
5 - L
5 - M
4 - S

Front and Back - $300 plus shipping $15.

Front Only $220 plus shipping $15..

Shipping 10 business days