I've just tried this
Gus Dry Meyer Lemon for the first time. (Sodas were on sale at Cost Plus.)
I don't think it's the bitter lemon Cathy2 and I are looking for, but it's quite dry and refreshing. My thought is that it's not lemony, tart or bitter enough, but it was pleasant enough that I'm now interested in trying the other flavors.
Alas, like the Izze grapefruit soda that I adore, it is quite expensive.
San Pellegrino Limonata continues to be the best locally obtainable alternative to European bitter lemon, in my opinion, in terms of flavor profile, availability and value, though I do pick up a bottle or two of Club Lemon every time I'm at Woodman's.
For the tonic lovers out there I do have a tip: Safeway brand tonic at Dominick's, which frequently goes on sale for 10 sixpacks for $10, is actually quite good. I like it as well as any brands I've tried except possibly Schweppes, much better than any other generics, and you can't beat the price.
C2, did you ever try the homemade lemon soda with tonic?