These are normally around $20.
They are playable, but the screen is tiny! So they are mostly a collectible or nostalgia item.
Galaxian $12.88
https://www.amazon.com/Tiny-Arcad…B06Y4BX
https://www.walmart.com/ip/Tiny-A…/397543913
Space Invaders $12.88
https://www.amazon.com/Tiny-Arcad…B06Y4DR
https://www.walmart.com/ip/Tiny-A…/386343515
Ms. Pac-Man $12.88
https://www.walmart.com/ip/Tiny-A…/548597783
$15 at Amazon
https://www.amazon.com/Tiny-Arcad…B076Q8L
Pac-Man $19.61 - Normal price.
https://www.amazon.com/Tiny-Arcad…B06Y4G5