I wore my new lace-up flats yesterday for the first time and discovered that I really would prefer more support, although I've long been a diehard flats-over-heels person. Can anyone suggest an OTC orthotic insole that works for very flat shoes?

I know they usually don't work well for flats, but I'm hoping the laces will help hold my (low-volume) foot in. I've heard good things about Superfeet but no direct experiences; my go-to for boots is the Dr. Scholl's for Her orthotic insole.