OK-- Cant get away with an April Fools day prank so, here are a few things to consider.
Aerial to Underground percentage
Front to Rear easement percentage
Is the reverse active and will it be swept or balanced?
What type of documentation are you requiring, i.e. do you want a sweep book complete with all in-out levels, pads and eq's, voltage readings , pictures and eol data?
Are you going to require data left at each station after the sweep is complete?
Are the hours of operation limited for interruptions, or can work be performed 7 days a week 24 hours a day?
These questions will be asked by any reputable sweep contractor and they do reflect the price that will be quoted. With todays environment, and depending on the answer to the above questions, you may see prices anywhere from $0.07/ft to $0.25/ft which would be a little over $350/mi up to $1250/mi. Quite a variable for budgeting!
Post a little more information about what you want done and I am sure you will see a better ballpark figure posted here as to what you can expect to pay out.
Hope that helps.