I get the MP data from 2 sources. The first is from looking at an eSignal MP chart. Unfortunately eSignal's MP chart has a bug in it so you have to be careful with it. eSignal say that the bug will be fixed in the next beta version to be released which is good news. So I only use this as a confirming single print finder.
The second source: I have written an indicator that runs on eSignal (it's called the DVATool) that searches for and finds singles. This saves me having to search them out and prevents me from making errors (assumes that the indicator is bug free - so far testing hasn't shown up any bugs). It also pops up a box that alerts me when a single has formed and when one is filled and auto-draws the single print lines on a bar chart. It draws them in 3 different colors, 1 color for each of filled, confirmed, and unconfirmed singles.
There is an option to not remove the filled single print lines after they have filled (before the next day) and so I can go back and see how the singles worked in each market.