I don't know who that seller is to know whether they are a scammer or not, but do note that the seller is in Australia and the shipping for that package is quoted to the USA via Australia Post
International Courier, their most expensive service, equivalent to International Express Mail in the US, with prices
starting from $95.

Ironically, someone in another thread recently asked "How Much Does It Cost To Send A 10 X 13 Manila Envelope To Australia" and two of the responses said (emphasis mine),
Quote:
USA First Class International for country rate 6 (includes Australia) $2.90 to $15.27 by ounce if under a pound for flats (which is what you are mailing). When over a pound, $30.85 2 lbs, $46.75 3 lb and 4 lbs for $62.90.
Quote:
If it contains anything considered 'merchandise' (as opposed to simply correspondence), I think you will have to 'declare' it with the proper forms. I agree, go to PO and get their help. Be prepared for it to be costly.
https://goscf.com/t/84178&whichpage=1#777658If
First Class to Australia can cost US$63 then
Express Mail at US$200 seems plausible.
I assume the seller's postal rates domestically (within Australia) are much more reasonable, and if you click on "See Details" under postage charges,
ebay usually gives you options for alternative shipping methods (express mail vs first class versus seapost, etc.)