Yeah I have noticed that about UPS too. Some things are dirt cheap to ship, others are so expensive that I dident even bring enough money to pay for.

On occasion I build and sell my 80" RC submarine kit, and every time I have gone to ship it the price has been different. They are all identical in size and weight. once it was $65.00, and once it was $35... and the two destinations were similar in distance. Who knows.