It doesn't kill the temps too much, it is only half of a sheet of cardboard, most of cardboards insulating properties are due to the air pockets in-between the 2 layers. Since those air pockets do not exist, the heat loss is minimal.
As for shipping it really depends on where you buy it. shop around. This is where I get it shipping isn't too bad
I pay $28 for a 250 foot tool, and an additional $25 for shipping. (a single 250 foot roll gives me 125 cage changes so it lasts a long time)
http://www.papermart.com/Product%20P...x?GroupID=4608
(you can even get it in different colors from this vendor)
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