There are many Jewish books for sale on Amazon as well as ebays half.com at reasonable prices. You may also find some decent prices for used Jewish books on abebooks.com or alibris.com. You can also try searching specific book titles in google shopping and see the websites that come up.
I found this amazing website called http://www.jewishusedbooks.com , they have normal frum books at like 60 or 70% off…i saved big bucks by them
i just bought a bunch of books for my kids for Yom Tov and saved like $120!! big fan..plus this website is really well done!
feldheim puts their new books on sale relatively quickly and has amazing books on clearance. try their website or their outlet store. i have done very well on their books in the last few years.
there is a great site just launched cheapjewishbooks.com it has just a few books so far – i hope they add more books, but the books they have are extreamly cheap- brand new and much cheaper than even amazon! good luck.
Pinter on 14th Avenue has books for $1.
the difference on cheapjewishbooks is about – 2-3 dollars – I’m not sure why that is so cheap. You can go into zberman and probably get it for that price.