1.  Sign up as a Big Pile of Dog Shirts affiliate and earn 10% when a supporter shops here.  For signup info
Merchandise Option:  A group can opt to use their earnings to buy Big Pile of Dog Shirts products (at wholesale) to sell at events or to supporters and members, leveraging their earnings x 2.

2.  Let me help you design a t-shirt/sweatshirt especially for your group.  Then either take orders from members, or sell them at your next event.  With the discount ordering 20 or more tees gives you, you could invest $200 and raise from $300 to $400.  For more info

3.  Do number 2 above, but with custom decals.  Your group can get a 50% discount when ordering $125 or more.  (Custom decals are prices according to intricacy and size.)  See Sample Decals