Sources for dual A6 muffler assembly?

My 1999 A6 has over 100K miles now, and the muffler is disintegrating inside. I have looked online for a complete assembly (center muffler,
two side mufflers, all in one piece) without luck. I've got to believe the dealer will want $1500 for this piece.
Any suggestions?
David d h o e r l at mac "," com
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