I was informed by Aust Customs that imports under aus$1,000 would not incur any import duty and would not be subject to GST. That information was given to me over the phone back in Sept...

Do a search on dhgate.com and you will find a few. I don't know if they are cheap as I don't know much about tennis racquets.

You can also respond to the feedback so your side of the story appears under the negative feedback

If you do a search of dhgate.com you will find quite a few breathalyzers

If you do a search you will find a few threads on ChinaDVDwholesaler in this forum. The comments aren't really flattering. On other forums they also get negative comments.