There is an idea to outsource marketing and sales services in the way as development is outsourced.
It could be a fixed-price payment on per month basis for _dedicated_ marketing & sales manager that works for the specific (not his own) company, plus % of payment for found projects for the marketing/sales manager.
Could you please let me know if the service could be of interest for you ( your development company ) and in what extent (size of fixed payment + % of project ). Please use the "size of fixed payment" as your bid number. Thanks!