Where to get decaf coffee beans in Japan?

Hello,

Can't have much caffeine but enjoy coffee a lot!
Have a great Delonghi that grinds the beans as part of the machine.
A few months ago, Costco carried an excellent bag of Kirkland brand decaf coffee but it hasn't been there for a while!
Why do all good products disappear… :')

I've tried a few ones on Amazon with mixed results.
Looking for a good 'taste to price' ratio, but a lot of those bags are pretty expensive for like 100-200g bags.

Those Kirkland ones pop up on Amazon every now and then for like 1,000 yen+ more but looking for another source/alternative if anyone has any good suggestions.

Thanks!