Hi M. If you're based in Europe, there are some websites which sell magic "truffles", which may be your best bet. The two I am aware of are called "wholecelium" and "truffle magic" but I'm not sure if they are both still supplying. I'm unfamiliar with any North American suppliers though, but it's possible they may also ship there. Try googling "buy magic truffles" and see what comes up.

If not, there is also the "dark web" option... but I have not used that, (un)fortunately.

Lastly, mushroom "season" will be on us in a couple of months, so if you're feeling adventurous there is also the foraging option.

Best of luck