All the official merchandise relating to "Guardians of the Galaxy Vol.2" is pretty hot right now, (yes, even the Doritos bag reported by Billboard.com, is now commanding prices of up to $5,000 on eBay.com) but there is another older piece of technology closely associated with the movie that is, according to a recent story in The Hollywood Reporter, also garnering increased prices among collectors.

Debuting in Japan in 1979, and in the US in the following year, the Sony TPS-L2 was the first portable personal cassette player ever released. But today, it is probably more familiar to film fans as being the Star-Lord's favorite mode of aural entertainment.

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Back in 1980, a new TPS-L2, which was marketed under the "Soundaround" brand (yes, this thing even predated the term "Walkman,") would have set you back around $200 -- a pretty hefty price at the time.

But thanks to fan interest sparked by the TPS-L2 prominent role in "GotG Vol. 2," old TPS-L2s are beginning to attract asking prices approaching its original retail value on the eBay.com, and in some cases, far more.

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It is now surely just a matter of time until fans start asking Chris Pratt, who plays the the TPS-L2-toting hero in the movie, to sign their cassette players.

In theaters now, “Guardians of the Galaxy Vol. 2” stars Chris Pratt as Star-Lord, Zoe Saldana as Gamora, Dave Bautista as Drax the Destroyer, Vin Diesel as Baby Groot, Bradley Cooper as Rocket Raccoon, Michael Rooker as Yondu Udonta, Karen Gillan as Nebula, Pom Klementieff as Mantis, Elizabeth Debicki as Ayesha, Chris Sullivan as Taserface, Sean Gunn as Kraglin, Glenn Close as Irani Rael and Kurt Russell as Ego.