I posted not too long ago about this. I raise mice, so since I got my '02 female jungle back in April that is just about all she has been fed (she ate one small rat, other than that, all mice). I usually feed her 4-6 large mice every 5-7 days. In April she was around 880g, now she is around 2700g and is looking like she will lay a nice clutch this summer. It does take more food items, but it worked fine for her. Luckily with her all I have to do is leave a pile of FT and when I come back they are all gone! So not too time consuming at all.
I also have 4 IJs that are between 500g and 900g, and they are all eating 2-4 mice every 5-7 days. But they too are great eaters for me. But if you don't raise your own mice, it would for sure be more expensive doing it the mouse way. There's my .02
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Ben