There are some units that work great but are pretty expensive. Some people prefer using comparators that were used in old slot machines and the like. There was a company in Vegas that sold them for Bally slots etc. I had their number somewhere... if I run across it I'll send it your way.
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The one you referenced is wired for easy use. Here's a cheap set up using a unit like this:
Home Made Penny Coin Sorter Under $40
I think this is the cheapest comparator on out there:
Top Entry CPU Coin Acceptor Selector Mechanism
There are some units that work great but are pretty expensive. Some people prefer using comparators that were used in old slot machines and the like. There was a company in Vegas that sold them for Bally slots etc. I had their number somewhere... if I run across it I'll send it your way.
edited to repair link