Your string head is part number 26 in the diagram. Home Depot's Garden department has a wide variety of parts including universal string heads and heads for Homelite, Ryobi, etc. and possibly one that will fit your machine. A lot of these trimmers have Poulan engine and trimmer head parts. See if you can get the complete assembly off the trimmer (if you haven't already) and take it with you to the HD and match it with a new one. The price of parts from an online supplier plus shipping will be almost as much as a complete replacement head. If you shop Ebay, there are literally hundreds and hundreds of weed trimmer parts on there and some good deals to boot.
http://www.mowerpartsweb.com/MANUALS/POULAN/PPB335.PDF
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