For those who stay up all night crunching numbers, Sambuca Café at 105 Mulberry Street, near Canal, is offering 5-cent espressos and 10-cent cappuccinos on Tax Day, April 15, from 4 p.m. to 7 p.m. Sure, coffee at work is free, but we’re guessing this stuff is a step up. We hope you won’t have to fill out three separate forms to get it.