Who gives a good price for 2nd Hand Catalytic Converters

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I have heard that a second hand Catalytic Converter can be sold for a few bucks

I saw once FTG Auto Salvage Advertised $40 per Cat
Talked to a Home Wrecker other side of Town and he gets $70

Where is a good place that pays nice prices for 2nd Hand Cats in South East Victoria? Somewhere inbetween $40 and $70 would be awesome

Cant hurt to Ask as I am sure someone is in the know here...........

Cheers

Rosco