how much would you pay for a customized b2b leads list?

hello everyone,

BRIEF: how much would you pay for a b2b leads list, which you customize by industry, location, size and other criteria, formulated so it's quick and easy to rule-out futile leads and focus on the really prospective ones?

(i know there are services offering the similar, but they all seem too expensive - like $250 for 1,000 leads, of those maybe 10% are actually prospective).

ok, now the long story:

i'm a freelance developer (hence i'm not all too familiar with telemarketing). i recently completed a project for a telemarketing company. that project involved composing lists of businesses & contacts details in the U.S. per location, industry, size, financial stats, and other parameters. each result - when said criteria set right - was actually a quite prospective b2b leads list.

the method i suggested and implemented impressed the client considerably, to a degree i'm now considering formulating it into a "shelf product" (software), for small/medium businesses looking for prospective leads. that goes for any business, not the telemarketing industry.

i need some advice on how to price the leads lists generated by my software. the process is as follows:

1) you are a small/medium business wanting new leads.

2) you use my software: you define industry,location,size, and some other parameters.

3) you get an extensive list of businesses matching your criteria.

4) you filter the results by many additional criteria, to focus on the prospective leads.

the list contains additional data organized in a table, to help you easily rule-out futile leads and focus on the prospective ones - for example businesses that work from home (or not), are a franchise (or not), have a web site (or not), sales volume, credit score, etc.

to illustrate, say you narrow the extensive list down to few hundreds leads. of those, say you filter-out 80% as irrelevant (for whatever reason), you get a really good shot at the remaining few dozens.

and the real beauty of it is that the entire process can be completed within the hour, and requires little to no knowledge of either marketing or using a computer: you get the extensive list within minutes. further filtering is as easy as filtering in Excel, with direct links to the business website and geolocation (and other resources) to help you build your impression of the lead in seconds.

so, how much would you pay for this kind of a service?

note that the contact information includes contact person(s) name, mailing address, and phone number. email is subject to the CAN-SPAM act, and (perhaps) may be retrieved as an additional step (but still not complicated and suitable for everyone's use).

any feedback is appreciated!