Ten minutes! Wow. Did you check eBay? There are definitely examples for sale there. Holography-specific groups have hints on where to buy some too. The popular

Ten minutes! Wow. Did you check eBay? There are definitely examples for sale there. Holography-specific groups have hints on where to buy some too. The popular ones are hard to find, but you can make them yourself at home or find less sophisticated pieces for sale occasionally.