The Buy It Price of $8.00 didn't seem too bad UNTIL you see the S&H, mine showed $18.00 !!!!!!!!!!!
Use your favorite search engine and search for "acrylic eyes", there are some stores on-line that sell at a good price and am sure the shipping and handling has to be a lot cheaper.
HG is correct they are a custom made assembly driven by a microprocessor, yes there are 3 colour LEDs readily available but the SkullTroniX eyes have brightness control over 7 colours from a single servo channel.