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Advance Auto, Autozone, RockAuto, RCM, SHOSource, would be the main vendors to look at. Probably avoid the Airtex brand tho. SHOSource stocks the Walbro, so that would be my first choice.
If you only want to do the job once, go with a Walbro. Not to mention they are not that much more money than the junk you will find at the local auto parts store.