If I were crafting a page title (title element), I might do something like this...
<title>Widget - Cheap Blue Widgets in California</title>
...or something to that effect. You can be creative when targeting singular and plural terms.
In regards to AdWords titles, you have limitations and need to be creative with title and description. There will be others who are more adept in the AdWords thingy than I.
You are always better off putting in as many variations as possible. All possible plurals, misspellings and typos. Adwords will initially sort them alphabetically but will begin to sort them by # of immpressions as the immpressions occur. So it does not matter what order you put them in .