I hadn't noticed the reduced sugar lemon cake. I shall look for it today. I'll be stocking up at the cheap store, but can stop by the expensive one to check there if I need to.
I think I'm going to go with canned pineapple, real fruit, the reduced sugar cake and regular Sprite. I keep cans of Sprite around for DH, but Diet Sprite would just go bad around here. I guess I could buy a single can of it from a vending machine. At any rate, that brings the calories down to 263 for the generous 1/10th servings and a lovely 146 for the more reasonable 1/18th servings. And, it'd be a lot of good fruit, right?
And, I may even consider splitting the package of cake mix and only using 2/3 (maybe even 1/2). The last time I made it, the topping was a little too ample anyway. We'd have been happy with it smaller. (And, since I'll probably actually be making a 1/2 recipe, the cake mix will stretch for three of 'em!) That would bring the recipe down to 199 calories for mongo portions or 110 for the smaller ones.