13 E. 13th St. (between University Pl & 5th Ave.)
Wine Bar $$
Happy Hour: M-F 4pm-7pm
Corkbuzz is a restaurant and wine bar (and retail wine store) located in Union Square (they also have a location in Chelsea). You can have charcuterie (with cheese from Murray's) or eat dinner here with wine flights available as well.
M-F they have happy hour from 4-7pm with blind tasting flights (red or white) for $15. They also offer half priced bottles of champagne after 9pm and all day Sunday.