Instinct is back in stock on Amazon:

https://www.amazon.com/Hasbro-Dropmix-Playlist-Fantastic-Expansion/dp/B076D3QR8P/ref=sr_ph_1?ie=UTF8&qid=1549325236&sr=sr-1&keywords=dropmix+instinct

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It’s been going in and out of stock on Amazon since early Wednesday, I believe. And that’s currently the only place to find it.

Hasbro Dropmix Playlist Pack (Instinct) Expansion for Music Mixing Board & Card Game https://www.amazon.com/dp/B076D3QR8P/ref=cm_sw_r_cp_api_i_MEwhCbC7EMEWP

US Amazon, at least... Hopefully that's what you need.
https://www.amazon.com/dp/B076D3QR8P

Edit: Interestingly enough, the URL I originally had SAID Fantastic, but went to Instinct anyway. I cleaned it up so it's not confusing anymore