Lol I've probably been to the same bookmarkets. Of all the manga that I own I've mostly bought the manga at some bookmarket for 1,95 euro and some in specialty stores but that varies between 9,95~18 euro's.

I might start buying online if it is cheaper but then again I do not buy that much manga anymore and the price is quite high with my current funds.

Don't mean to take the moral high ground here, but as a librarian, I feel have to say something. And that something is this: Please, please, please, please, please don't steal from libraries! Especially ones that are publicly funded! We generally don't have huge budgets and lose literally thousands of dollars each year due to patron theft. (And I've seen the numbers -- they are far from pretty.) And while it may seem like you "always managed to get away with it," depending on when you committed your acts of theft (i.e. five years ago as opposed to fifty), you may find you no longer have access to those public libraries, or any library affiliated with them, or libraries unaffiliated with them but within the same geographic location. It may seem easy to walk out with books and never return them, but we DO keep track of thieving patrons(if you actually checked the books out), and until they pay their dues or return the stolen materials, their access to libraries all over the state is completely cut off. No library wants to lend materials to a thief, after all. (We've even had a police detective come in before, criminally investigating one such patron.)

Alright, I'm done being a librarian.

In response to the actual poll, I don't buy much manga anymore, but when I was younger, I mostly bought mine from large retailers. Ever since Borders went under, I've been buying less altogether and very rarely from actual stores. (By which I mean, I don't really impulse buy anymore.) These days, if there's a manga I want, I usually get it somewhere online, wherever I can find it cheapest.