You could also contact auctioneers about doing a patron auction, a one time "speed" big auction of all your collectibles, and set the opening bids at the lower end of the estimated fair price range. This would be faster than going the shop route, if you don't want this to be a long term project, but the sales probably wouldn't be as high per collectible as carefully matching up a buyer with their desired cat one at a time...Another route would be to put them on the SL Marketplace, but then there are factors like commission price and that the buyer would need to buy a Get Well vitamin after purchase. Plus, I have read that if the older style Marketplace "Magic Box" for limited quantity items is located on a sim and no avis are present, the sim shuts down partially and any sales from the Magic Box don't get delivered...seems there are pros and cons to every sales method
Best wishes and hope your precious collectibles find good homes!