In NYC there's no one street like Berwick St in London with a ton of
record shops on it. They are all located in the same sorta general
neighborhood though.
Check Strange and Breakbeat Science on E 9th Street; Throb on E 14th St;
Temple on Lafayette (under Liquid Sky shop); Etherea on Ave A; and most
importantly OTHER Music on E. 4th St across from the Tower Records. Lots
of cool noise/experimental stuff...