i can't believe it took me two years to go to Frugal MacDoogal's!
It is the best place to go if you're stocking up the liquor cabinet. i was always under the impression that it was cash only, but you can use credit card. There is however like a 2% discount if you use cash or debit card.
A handle of Captain was about 6 or 7 dollars cheaper than the ABC stores. $19.99 cash/debit.
i didn't notice too much savings on the beer side, although there was a decent price on some of the Rogue bottles when i was there.