Oftentimes the shipping estimate for those things is the walk-in counter price at one of the shipping resellers and includes the inflated packaging cost as well.
If you're interested in an item it can't hurt to email the seller and ask for clarification on the shipping charge, or to ask for the estimated shipping weight and do your own research. There's nothing wrong with obtaining shipping quotes, then going back to the seller to say "if I win the item it looks as if we [make it a group effort] can ship that puppy for substantially less than your initial estimate, here's what I found."
Then again, sometimes it is cheaper in the long run to buy the item new from a reputable vendor. Until gas prices started going through the roof there were several knit/spin/weave vendors who offered free shipping for orders over $$$.
Do your research :)
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Reply to the list as I do not publish an email address to USENET. This practice has cut my spam by more than 95%. Of course, I did have to abandon a perfectly good email account...