Normally, 40% would be seen as big savings.
PERKOPOLIS is unlimited use, so it can be used on cheap books as well. I never use single-use coupons for cheap books. Most of the time, I have some very expensive omnibus waiting, to be discounted using a 75%+ code.
Strangely enough though, regarding Raymond E. Feist, his omnibuses are often MUCH more expensive than the separate books. You can get three of his older Riftwar Cycle books for €12 or so (priced like €1.99, €3.99 and €5.99), while the same books as an omnibus cost €20+. I find that a strange situation.
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