I see two sellers with different quantities of the same model MOSFET that I'm looking for. I'm suspicious but also a newbie.

5x at $1.5 each https://www.amazon.com/IRFZ44NPBF-N-Channel-Field-Effect-Transitor-Compliant/dp/B06ZZHK273/ref=sr_1_1?ie=UTF8&qid=1514493280&sr=8-1&keywords=irfz44n

50x at $0.28 each https://www.amazon.com/DAOKI-Transistor-N-Channel-International-Rectifier/dp/B019WOPM1Q/ref=sr_1_9?ie=UTF8&qid=1514492953&sr=8-9&keywords=mosfet

Am I missing something or did I find a great deal?