Check the manufacturer info section of this site.
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Chazzbo, here's the info that i could find out about the aforementioned gear.
The Lambda listed for $1695 in 1993
The Digital Link Mk II was $499 in 1992
The Delta 100 showed $1195 in 1992
The 4.6 was $699 in 1989
All of these prices were taken from Audio magazine's annual buyer's guides of the mentioned year. All list prices were submitted by the manufacturers. I have seen some variances from what was published and what one runs into amongst other sources though, so take that into consideration. Hope this helps... Sean