First time around, i missed it, so where are they?

Uh, you should have gotten one automatically when you defeat Meltigemini in Mount Gulug on disc 3 - it's given to you automatically after the scenes following the battle's end, so unless you've thrown it away I have no idea how you could have missed it (in which case, you're out of luck).

I seem to recall maybe another one can be found somewhere else, but as far as I know for sure, the one Eiko receives automatically in disc 3 is the only one available I'm sorry (as it's needed for her summon Madeen, her ultimate eidolon as well as give's her the 'Guardian Mog' ability.).

i could have sworn that there was more than one

ooooo looks like i can be of some help to you Nos, im pretty positive you can buy them at the auction in treno, not sure how many, and there crazy expensive like 100,000 i think, i KNOW for a fact you can get one through the chocograph. don't remember where though

here i took 5 minutes to look this up for everyone

Name: Ribbon
Info: "Item that always keeps mog beside you"
Price: N/A
Sell: 1 Gil
Strength: +1
Magic: +3
Spirit: +1
Defence: +1
Evade: +5
Mag Def: +1
Mag Evade: +4
Element: Absorbs Water/Wind, half's Fire/Ice/Thunder/Holy
Abilities: Ability Up, Guardian Mog and Madeen
Used by: Zidane, Steiner, Vivi, Garnet, Amarant, Freya, Quina and Eiko
Location: Got automatically at Mount Gulug (Disc 3)
: Found in the Chocograph 24, Forgotten Island (Disc 3/4)
: Buy from the Treno Auction (Disc 4) 90,000
: Given to you by Stiltzkin at Alexandria (Disc 4) Fund stiltzkin's journey around the world

thank you ff7genie, sorry for taking so long to respond