Karen,
What does your company sell, and where do they sell it? It really matters, for in this space, the professionals that you sell to are really, really overworked. You need something that will make their lives easier, and/or allow them to do their job faster/better. Having served in the business for 25 years, word of mouth works best, but clearly if your firm is new to the space, that will take some time. Would be happy to talk to you, so look me up on linkedin, and I would be happy to share some ideas. For example, the US Mail works really well.