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Hello there! I am currently looking for an SSD that is compatible with an Early 2011 15" inch MBP and is within a budget of $120. Any help would be greatly appreciated !

You can use any kind of ssd you can find as long as it uses the SATA I, SATA II, or SATA III compatible connection interface. So to answer your question yes, a Samsung 850, or 860 EVO or pro ssd will work!

Here ya go! Toshiba 2.5" 512 GB SSD. Better hurry! last one! And here’s the guide to put it in MacBook Pro 15" Unibody Early 2011 Hard Drive Replacement