Extravagant shipping charge


I purchased an item and already paid for the price.
The description says that the shipping cost will be determined later. I did not ask for the shipping before I made the payment. (Doh!)
The item weighs 55lb, and it is about 17x17x10 size. The shipping box will be about 20x20x15, and the total weight would be close to 60 lb.
For UPS shipping from Arizona to Michigan, the seller wants $150 for the shipping. When I calculated UPS shipping, it is less than $60. Obviously, the seller is trying to make a huge profit from shipping.
Any suggestion to how to deal with this situation?

Thanks.

128x128ihcho
This is an easy one.  Open up a FedEx or UPS account and let the seller use your account.  In fact, have the seller bring the item to a UPS store and have them package the item up and use your account to ship it.
If it comes damaged, you are responsible.

How much insurance was placed on the unit?  Did the seller use a new box, double box or anything special?  I ship items all the time, probably weekly.  A 60 pound item for $60 seems very cheap.  I recently shipped a SA-100 Counterpoint amp with $1500 to $2K insurance.  Cost was just under $75, 85 pound amp insured for $2500 was close to $150.  But again, depends on the insurance.  Have the seller send you a copy of the receipt.  
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Isn't it funny how you can buy a 55 lb bag of cat-litter on Amazon for cheaper than a pet store and shipping is free? 
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I don't understand all the grief the OP is getting here. $150 is too much to ship anything under a grand and smaller than laundry basket (size is more expensive than weight until well over 100#. I did a quick estimate on UPS.com and it was $49. Seller is taking advantage of you, big time.