If you do an advanced ebay search including finished sales, a few were sold recently:

 

From there, your best bet would be to set up an ebay alert and jump on one when it's published for sale

 

Hello!
Not so sure this is the right place to ask, but I did not find a more suitable place so I’m asking here
I’m looking after the rare Casio f87w, looked up on eBay and a few other websites but I simply couldn’t find anything.
Does this model pops up on eBay sometimes? Any other places I should look up for one? (I know about the f84w and I already own one, I’m interested in the f87w specifically)
Thanks in advance!!

I think I found a few of these in a box I inherited from my dad (who was Israeli, just like you I believe?). If I'm right (which I'll know this evening once I get home from work) I'll drop you a line! I'll be in Israel in April: will be easier to ship within IL than from the Netherlands outward.