Be bold - ask for rebates and promotions

Don't be afraid to ask your distributors to tell you AND show you the available programs.  Chances are they will not offer you the promotions and incentives and they'll end up keeping it.  These distributors will receive money back from their vendor partners for purchases they make and for purchases you make.  They get paid on what they sell you.  Don't be shy and ask the distributors to share or else you'll take your business elsewhere.  Now, this won't always work but asking shows that you are aware and then they'll be inclined to share in the future.  No guarantees on this one, but it can't hurt.