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Amazon has Marvel Legends Series Mjolnir Electronic Hammer, for $ 79.99 with free shipping.

Plastic
1:1 full scale 19.75-inch premium role play hammer
Authentically designed wrist strap and pommel
Voice-activated light features reveal the symbol of Odin
Premium detailing and finish
Includes Mjolnir electronic hammer and instructions
x3 1.5v AA alkaline batteries required (not included)

https://www.amazon.com/gp/product/B01IK52XS8

Alternatively, the same can be bought from Toys’RUS with free shipping at the same price.