Not sure why they make finding the fixtures for the MR16's so hard outside of ceiling mounts however...
An underemployed master electrician working in Lowe's electrical department where I was looking for a replacement MR16 lamp for the Solux bulb and not finding it, told me home builders overall are resorting to other "safer" more convenient fixture type lighting connects due to the many reports of fires caused by 12 volt MR16 fixtures. Something about questionable transformer quality control issues overseas. Go figure.
Not saying they're all doing this but when there are better, cheaper, safer ways of lighting that don't require 12 volt transformers, the market dictates why regular MR16 non-track lighting lamps aren't as readily available and if they are, they're going for an outrageous price like $100+ as mentioned above for the Solux desk lamp.
Why so much for a lamp? Whata' ya bet most of the cost is going into say...the transformer!
I've got an Alzo digital 150 watt output CFL bulb I leave on all day, everyday. It's cool to the touch, adequately neutral looking and hasn't crapped out on me. Cost me $10 from Amazon. Fills my entire 12x14 living room with tons of light to where I don't need any other lights on. Doesn't produce so much heat that it causes my AC to constantly kick in like it does running hot lights.