When your wallet is dwindling toward empty, the most luxurious spots start to feel like deserts full of shimmering, inviting oases that evaporate the second you try to parch your thirst. Take Lincoln Road: You can spend all day staring into hip restaurants packed with beautiful people scarfing sumptuous dinners, but if you have only 20 bucks to drop, you might as well be stranded in the Sahara. Until you stumble into Doraku. Happen into the sushi joint between 5 and 7 p.m. seven days a week, and even your meager cash will buy enough to stuff the hungriest Bedouin. Doraku, the brainchild of Kevin Aoki — son of legendary Benihana founder Rocky Aoki — already serves the best sushi in South Beach in one of the most chill settings, a sumptuously lit maze of birdcages and deeply recessed booths. So it's music to a broke diner's ears that Doraku also boasts the best sushi happy hour in the Magic City. Check it: Four bucks buys you a generously portioned crunchy crab or tuna avocado roll, and $3 brings a Doraku California. Wash everything down with $3 drafts of Kirin, Sapporo, or Shock Top and $4 specialty martinis, and before you know it, you're fed and tipsy for a crazy-cheap check. And don't worry: It's no mirage.