I don't know why they are priced what they are priced at. Could be low demand, high cost of material or labor intensive to build. I don't know. But I do know this, if i looked at every single aspect and piece of railroading as affordable versus expensive I probably wouldn't do it at all. It varies from railroad to railroad, but think of the time and money many people invest in their road. Another $200 seems trivial in the big picture.
just make your own.
take the LGB connector type, fit it to the permanent railend, weld it there.
then cut directly in front of the railend throug the vertical sides of the connector. leaving the horizontal bottom intact.
bend the sides, that they are shaped like a "V". (the inner side not too high)
glue a small piece of wood of sleeper-height under the protubing part of the connector, that it can not bow downwards.
if you got two left hands, it might take you half an hour each. plus some cents for the connectors.
Anyway, the lift out "clamps" are $15 a pair from hillman/silvergate in brass, and $30 a pair in SS from split jaw, hillman/silvergate no longer offers them in nickle plate, but I do not recommend the nickle plate, I have gotten some corrosion on my nickle-plated wheel stops from hillman, and obviously there is no current going through them!