UPDATE*****
I checked at Great Models.
The Friulmodel sprockets are # AW20, sell for $8.00, and are not in stock.
The Friul tracks are # ATL30, are $37.95 (They've gone way up since I bought them!!), and are in stock.
And the Model Kasten tracks are # SK25, sell for $24.95, and are not in stock.
I've built a couple of Friul sets and find them easy to work with. I've built the Model Kasten set for the Panther, found them fairly easy to build, beautifully detailed, and a pain the the butt to use. (They are very fragile and kept breaking apart on me.)
I believe the engine I got was by Tank Workshop. I found one on Great Models (not in stock, of course). # TW1047 for $4.25.
And one last one, the Eduard set I used is ed35350 and sells for $15. It is not in stock.
Note that all these prices are from GM. Other sites may differ quite a bit.
Mission Models and RJ Enterprises carry most of these sets too, I believe.
Bill
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DML M4A2 Red Army
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-- There is a fine line between "hobby" and "mental illness". (Author unknown)