Sorry I'm a bit late to the party as I know you've got a lot of toys already but
Amazon.co.uk sells Da Bird
https://www.amazon.co.uk/gp/aw/d/B000F9 ... ref=plSrchThey also sell Neko flies if you search for them
This store also sells Neko flies and some pretty awesome cardboard products although they can be a bit expensive
http://www.specially4cats.co.ukAnother place where I get toys, bowls and food etc is Zooplus.co.uk who I believe are based in Germany so there should be a German version of the website and they're great for getting food etc in bulk.
Favourite toy of my little girl before she passed where simple card board boxes lmao yeah I know cliche but she always wanted the box her toys came in over the toys. You can have a look to see if you can find one of those cardboard box houses they do for cheap which cats love otherwise the cardboard scratching mats are pretty awesome as well.
Otherwise she used to carry around a Kong Catnip mouse and the Kong wubba toys are good fun for playing fetch with. Also kickeroos can be pretty good.
I'll have to see how my toy stash works with my 2 kittens that are coming next week and tell you if anything survives lol.
Only other thing I can recommend and I know it's not a toy but if he does turn out to be a cuddle cat have a look into getting a Mewgaroo, you might have seen them they're these Japanese hoodies with a padded pouch pocket in the front where your cat can sit in and cuddle up to you. You can also technically carry them around in it that said I haven't tried a full grown male Bengal in there yet just my chihuahua and my small female Bengal lol, but it would be OK whilst he's still growing. They're good for if you're siting at your desk at your PC as you know your cat won't fall off your lap or if you are watching tv or something.