What Greg L said...
I've had pretty good luck at shows, too. If you're on the western-ish side of the lower 48, a trip to the Miwall table usually puts a dent in the wallet and a smile on the face. Their selection varies a bit from show to show, but I have purchased Aguila/Colibri from them.
http://www.miwallcorp.com/schedule/2003schedbylocation.pdf
And yes, the nice folks will let you borrow their hand truck for a few minutes if you're buying in quantity...
To continue the parrot motif of this post
I'm with Blues Bear on the Aguila 60-grainers. (Pic and specs at the bottom of the first page of
http://www.aguilaammo.com/rimfire.pdf) They're quiet and accurate, they feed in my CZ75 Kadet, and there's something inherently amusing about throwing that big ol' boxcar full of lead out of a .22 (the bullet-to-case ratio of the cartridge is about 2/3 - 1/3)...
...And a late update after more surfing on the subject. Sez here:
http://www.22ammo.com/aguila.html
"The Aguila company has deleted Colibri from its inventory"
I don't know these guys from 1-Adam-12, but it might be a clue on your original supplier's decision, Sentry. Good luck in the search!