The crown stops are still a current product, so you can guesstimate a percentage of the current price.
The kapex EB-set has been discontinued in Europe now aswell, I don't know since when, but my guess is since the kapex refresh. When it was still available I remember it being more expensive than the UG set, can't check anymore, but probably because of the mft/kapex vs the cart.
The other parts are still available as trimming attachment for the CS50/70 tablesaws. (only difference is the starting point of the tape-measure).
link to festool uk site
The KA-KS 120 is also compatible with the mft3, it can be installed on the protractor head as a higher, longer fence on which you can place flipstops.
The left and right version are exactly the same part, you only need to partially dissassemble and reassemble. (in case you have multiple people interested in 1 of them)
I have the kapex eb set since they became available, at first I found it cumbersome, but after I ordered and installed some extra parts (featherkeys, bolts and supportbrackets) I liked it and still use it regularly, both with my kapex and CS70.
