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Dunno where you saw it, but they are all over eBay. In addition, O'Reilly, Advance, AutoZone, NAPA, etc. all have them. If you just need a reader for OBD-I, that's a pretty standard price.
For your 91, you don't need to spend the $$ for a reader (unless you just want another gadget). Auto Zone used to sell a "key" for OBD I for ~$1.50. Even had the prongs labled AB, AG etc. Just use that (or a bent paperclip) to jump "A" and "G", turn your ignition to the run position, and your speedo becomes the reader.
WHOA! Steel how the heck do you know what is wrong with it? What do you mean your speedo becomes the reader? I think there is a 02 sensor is bad, the gauges won't tell me that? Will they?
WHOA! Steel how the heck do you know what is wrong with it? What do you mean your speedo becomes the reader? I think there is a 02 sensor is bad, the gauges won't tell me that? Will they?