I have been looking for Final fantasy 7 collectibles on e-bay but having the film Advent Childeren based on the game of the same name, it is differcault to get the collectibles you are after. I find items under the name of FF VII are mostly of the film and not from the game e.g.  Final Fantasy 7 watch cauld be from Adavent Children the film. You need to open up the page to double check item then just reading the search results.!

I hope this helps!

Ben