if all else fails go online and get a culture of california red wrigglers and raise your own in a big tupperware tub. Takes a couple of weeks/months to get the culture going, but it does work. Look up methods online as well. I've had no luck, but I seem to be the only one (read: knucklehead) to screw this up.
They're relatively small compared to night-crawlers so you don't need to cut them up and they're easy to keep/raise and you can control their chemical intake and (sort of) influence their nutritional value through gut-loading. They also don't (seem to) drown and live in the substrate until the fish dig 'em up. Makes for habitat enrichment and keeps fish active between feedings, particularly for bright fish like loaches or eels (or puffers or mormyrids blah blah blah).