Tom Spina is a prop restorer, and one of the best in the business. I first met Tom at the Christie's Star Trek auction and have done business with him and chat with him whenever Star Trek is the topic he needs a "fix" of.
Tom has one of Spock's headbands from Star Trek IV:The Voyage Home and has put it up for sale. It was originally from IAW. Here is Tom's description from his add on the Star Trek Prop, Costume & Auction Forum:
An original Spock headband from The Voyage Home - $1999 shipped (or best offer) in the US. Comes with shown display stand and a COA from It's a Wrap who got the item directly from Paramount. The second pic shows the inside of the headband - the folds are stitched closed through the center of the piece but the ends are not so they "flare out" as shown.
email Tomspina@mac.com with any offers and thanks!