3rd Annual Family & Friends Fishing Frenzie - T-Shirt and/or Deposit!!

Ok everyone, you all know the drill..... I have the contract for our fishing trip but it's your turn to help right now.  I am requesting $20 deposit from each person that is coming on the trip in order to secure our date with the required deposit.
If you would like to purchase a T-Shirt, the price is $15.  However, the more shirts sold, the less it will cost us to produce. If 50 shirts are purchased, the price will go down between $7-$10.  I will take the difference of the $15 you paid from what the final cost of the shirt will be off of your balance for the fishing trip.