There were several different sets of free pins before EDL opened up in 1991/1992. If I remember right, these were the Esso ones (I have all these plus the kodak ones too). They are great for Disney historians like me, and one day they may be valuable, but cast members will not trade them.
If I remember, the EuroDisney one was on sale the first year (again, not cloisonee, so not tradeable). And the WDW Disneyana was a free one for people who went to the Disneyana fan conference which was not an official Disney event.
I hope that helps you decide.