"Poor buyer"??? Please...if you can afford to buy an engine you can afford the tax. If you can't afford the former, the latter doesn't matter.
Now as for corporate greed which sets the prices, takes that 18% and the government which imposes those taxes - these are completely different topics.
To answer your question -
- Craigslist
- Bonanza
- EBid
- Newegg
- TradeMe
- Onlineauction.com
-Greg