Yes, it is wise to run a filter before your fuel pump. I have a picture below of my fuel system, which has two inline filters.
As for locating a fuel filter, I purchased everything below from Summit. My pre-pump filter is a Professional Products inline filter. You usually want a higher Micron filter first, than a lower Micron filter pre-injectors. Most of the filters on Summit come in a NPT fitting style, so you can convert that to any type of hose you may be using. (Convert this to barbed hose, to run 12mm line, etc..)
Links to the filters I am using.
Pre Pump Filter
Post Pumps