Im pretty sure they r very old, 2001-2 maybe. I havent found any specs either, but i did find a review on one from 2002. 60 dollars isnt alot, but i dont think the retail value is much if anything. On Ebay ones of similar ages go for about £10-20 by the looks of it.
Here r the specs for the Tecra 730...
The T2105CS appears to be a 486DX 50, 10inch screen 20mb ram 1.4gbhdd (from ebay add so may have been upgraded)
As u can see they so old i wouldnt bother buying them! the 486 is pretty useless unless u want one for programming basic on lol, and the batteries will be shot as well as the cmos batteries.