I did the same thing, gave them a price list which I made cheaper by a buck or two on each thing than there previous company. They gave me the deals but nothing was written in a contract, but like mentioned above it should have been. After I shot all the pics for the first season (spring) and had them at the printer they asked about the "free plaques" I was supposed to be giving to the teams sponsors. Well that was something never talked to me about, I didn't know about any plaques and just assumed the league took care of them. Also, something they forgot to mention was that coaches get free 5x7 prints.
Luckily I'm local, know all the heads of the leagues so it wasn't a big deal, we worked out a deal that the league paid for the plaques and I got the coaches there 5x7 photos which was no big deal. Now, if I was out of town doing a league I definately would have had more problems I think in this and recommend a contract or somethng in writing stating exactly what you are providing. Cover all the bases, maybe have a blanket one and you and the commisioner fill out the form together as to what you do get, and what they don't get.
Several photogs now "donate" back to the league, which I don't because my profit margin is razor thin. If they ask about that, I'd tell them that you'll give x-amount each order but then raise your package prices up to compensate it. Especially if your profit margins are low - we have one guy who charges $64 a package that costs him about $3 - now that guy should be giving back!!! My $12 package that costs me $6 - umm, no!