I'm with Adam on this.
Started a page boost last night on a timed showing from 7am to 10pm so last night it ran for 2 hours from starting it.
Got one last night and one so far today both priced up and doing tomorrow.
£50 over 14 days so £3.50 per day with an estimated reach of 230,000 in a 5 mile radius.
Try leafleting that for £50.
I go visit every lead I get off it so can usually filter out the messers.
Also you get the add on jobs this way with Google you just get people wanting window cleaning.