Where can I find flasks for sale in Manhattan?

I am looking for something like the $25 ones offered at Things Remembered, with an engraving option. Can't order online - I need it by tonight.

In Manhattan, you can find them anywhere. Liquor stores, smoke shops, Chinatown, The Village... If you want a place that actually does the engraving, I'd recommend one of those slightly more upscale smoke shops. I don't know if this place has flasks, but I passed by this uppity looking tobacco shop near the SI ferry yesterday. I'm bad at streets, but it was down the block from Chipotle, lol.

one of the larger Liquour stores have them
if you don't see them ask the clerk there