If you have an air compressor, access to the polishing compounds, some aircraft paint stripper and some time, why not do them yourself? I did my 15X8's on my '79 TA and they came out real nice.
As already mentioned,
WWW.78ta.com has some great directions on how to do it. Look under the restoration tips section, the Snowflake section starts out with a factory type restoration done on a lathe, but further down he outlines the polish technique that I did to mine.
It's not that hard!!