Those sorts of technical books are often very expensive, and since I'd prefer to buy many books rather than just a few, I am price sensitive. So, I find 15 ISBNs I want on Amazon, now I want to plug those into some service - all at once - that will search current prices across many bookstores and find me the best deal. Except, I can't find any such service!
I found no aggregators and only two online bookstores that even let me enter more than one ISBN at a time, bookpool.com and softpro.com. (On other sites, the errors from entering more than one ISBN at a time can be mildy entertaining.) And neither of those bookstores carries more than 1 or 2 books out of the 15 I happen to be trying to find right now - which is useless.
So, is there a better solution out there? What do other compulsive mass quantity book buyers here do?