Yeah I remember that deal. I dug through the couch for change so I could buy as many as I could afford, and I think I finally ran out of them in November or December.
A 4-pack here would run close to $17.00; and I've only seen the 2-packs. Almost $9 for that. What a rip.
Of course, I'm also saddled with $14 apiece CR123 batteries in this toilet of a city.
They've got so many people so packed in this downtown area, that all the "good" stores like K-mart and Wall-Mart are way out in the woods, off the bus line because there isn't room to build one closer to town. While that's not too bad if you've got a car and can actually *get* to a target or a wall-mart, it leaves us car-less city guys rather screwed. :/
I do have a source for 123's if I need them (thank you - you know who you are!) but not for L91s. I buy them only if absolutely necessary, like when I tested an early CMG Reactor which recommends that battery type specifically.
Having just dumped my battery woes all over the floor, I can honestly say I've never tried lithiums in a Lightwave 2000, and I don't yet have a Lightwave 2100 to try them in. Guess I'd better have a little chat with Mr. Moen about that.