Well the individual dino cassettes easily reach more than $500 each on ebay, since these are Jap exclusives and was never mass marketed for worldwide fan consumption and are very hard to come by.Heroic Decepticon should be able to answer this more accurately as he has been able to buy the originals.. from Japan no less.... sigh if I had such disposable income to throw around, I'd prolly do so myself.
As for Barbie... isnt there like dozens of those cheap looking barbiesque dolls you might see on dollar shops and even toy stores, BUT those are really easy to spot as NOT Barbie and quality wise at a glance alone will definitely tell you, NOT worth a dollar to spend on. Most of the products fro Barbie would be erm ... doll clothing, right (?), anyone who can sew and has a sewing machine can do those clothes anywaysunlike the specialized accessories for TFs