I stumbled across this light in my local grocery store (Acme):
Eveready LED Economy 1D Size Flashlight with Battery (2 Pack)
http://www.amazon.com/dp/B004PZPB2I/?tag=cpf0b6-20
The price for the 2-pack was $5.98. They had singles for about $3.50. They're a very thin, cheaply made light that looks like your typical 2D incandescent cheapo flashlight. Interestingly (to me), they run on 1D cell - they have a freakishly long spring in them, and I don't think you could force two D cells into it unless you cut the spring shorter. Also, the positive terminal of the D cell is covered by a sticker that says "remove before using" - so it won't accidentally go on. They have a medium/weak beam, with a fairly tiny hotspot and thin spill. The output reminds me of the MJLED PR2 LED bulbs, although perhaps a bit narrower beam.
They won't win any kind of beauty contest or "top flashlight" contest, but what I think makes these lights a real winner is as an emergency light for those who couldn't care less about flashlights, or as a super cheap loaner light...It claims a 40-hour battery life. Running on a single D-cell battery, you don't have to worry about having a pair of batteries. You could loan these out to the unprepared with no real concerns about if it's ever returned to you - you could supply them with extra batteries at half the rate you'd need to do for an incandescent 2xD-cell flashlight, and if you really needed to, you could use a D-sized battery spacer for a AA rechargeable like an Eneloop. Really versatile and practical.