CVO, what countries do you typically travel to? I mainly get prepaid access in Asia, and have had good luck in a number of countries. I've found that most computer shops, some bookstores, and office-supply stores usually have some sort of local ISP. Also, hotel concierges are a lot more knowledgeable nowadays about decent, temporary ISP's.
From the
iPass Pricing Page
How Much Will it Cost?
The cost of roaming varies depending on the local number you call with iPASS. Most United States POPs will be charged at a rate of $2.96 per hour, but the price can be as high as $15.15 per hour or more overseas.
This seems awfully steep to me, especially if a temp local ISP is an option.