Ultra miniature Electrolytic capacitors

[Rob Strand]

Actually, there are low ESR low-profile caps out there. I know Peter used them in his VFE line but the specific part was either obsoleted or just not available the last time I looked.

Most low ESR's I see are quite tall.   When I repair stuff, the caps from smaller vendors tend to be even taller than the parts in equipment.    I have used tantalums in some charge pumps in the past.  For SMD you have the option of tantalums and (larger) ceramics.

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FWIW, unlike yourself I haven't *had* to find very small low ESR caps.