I'm still not buying that the 4562's are better. Unless the datasheets lie...
Anyway, that auction is just for the chips. $1.79 each isn't too bad. The reason you see them go for $100 is that it is including labor to install them. Many people are not going to be able to put these things in, it takes some fine soldering skills to do.
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-- It is by will alone I set my mind in motion...