ShopTo and Amazon are both selling it, for a bit of a premium compared to GAME, but the good news that it's at least in stock there.
https://www.shopto.net/video-games/ps4/PS4SP04-marvels-spiderman-special-edition
https://www.amazon.co.uk/Marvels-Spider-Man-Special-Edition-PS4/dp/B07C469781
The bad news that I've just discovered is that, if you value how these Special Edition boxes that Sony puts out for their PS4 exclusives look, then it appears that whoever is in charge of the design has absolutely destroyed any enthusiasm I once had for how this thing looks.
This is how they advertised it (and are still advertising it in the UK):
The final packaging based on some updated listing on other European retailers:
I mean, just how fucking disgusting does that look? They replaced the gorgeous deep red gradient background for a garish tomato red flat colour. They've replaced the cool embossed looking spider and made it, again, a boring flat white. They've reduced the size of the spider logo to accommodate the name of the game (which doesn't need to be there), and they've changed the logo on the spine to be less pronounced for some silly reason. It all looks so cheap and nasty for a premium special edition product, and WILL look truly bad on my shelf next to the rest of the good looking PS4 exclusive Special Edition boxes.
Why do these gross designs get signed off when the original art was so, so much more tasteful? Ugh.