Have your considered a partner/reseller/affiliate program?

Unlike direct sales force that require a high upfront labour cost, partner programs are highly scalable as partners only earn commission when a sale is generated.

I'd advise that your company be as partner friendly as possible. Commission is rarely the primary motivator for partners who earn the majority of their income offering their own services to your potential clients. If your company is hard to do business with, or the user experience tarnishes your partner's reputation they will stop sending new clients your way.

Cheers,

Mick