Last time I saw them new was at an Orschelin a few years back. I think they were about 7.00, certainly less than 10.00 But the quality is sorry : No nice ceramic-like plastic, not fine detailing, no airbrushed coats...They make them out of a metal substance that does not show up the detailing in the face and legs, the coats are all one color-even the manes and tails are the exact same shade as the body, and no stockings or blazes.
I made mine stables out of cardboard boxes, and I put dried grass as hay in there for them, and some seeds my father intended for planting. The cardboard stables looked very nice : Till mty parents found out and realized that not only was I stealing their planting seeds, I was putting out a rodent buffet in my bedroom. Thus endeth the great stablemate stable construction creativity project. (PS. All mine had names, too.)
The very small ones could live in shoebox corrals! Kira and I used to take ours out in the front yard, where our mothers had unaccountably invested in piles of mulch, which made THE perfect horse living arrangement.
Sounds like you had an equally elaborate set-up!