When making marketing proposals to your prospective clients, give them options. Create a proposal that empowers your business client options from which they can choose, including pricing options.  Clients who are presented with various options from which to choose are more likely to choose one of your options rather than rejecting the sole option due to price or other factors.  Providing options expresses to your clients a willingness on your part to do the hard work of research and preparation integral to any good marketing proposal. 

This is especially true in these times when marketing dollars may be tight.  If you customize your proposals to fit the unique needs and budgets of your clients you are more likely to succeed.