If you're hunting for Neocaridina davidi "Red Cherry" shrimp in Yonkers, two well-stocked aquarium stores carry them regularly:
Address: 2872 Central Park Ave, Yonkers, NY 10710
Notes: National chain; consistent supply of juvenile/adult cherry shrimp. Check the "Freshwater Invertebrates" tank. Call ahead for current stock: (914) 779-8200.
Address: 2004 Central Park Ave, Yonkers, NY 10710
Notes: Independent specialty shop; often carries higher-grade lines (Sakura, Fire Red, Painted) and knowledgeable staff for breeding advice. Phone: (914) 965-2200.
Both stores are within 1.5 miles of each other on Central Park Ave—easy to hit both in one trip.