Amazon books is one of those sites am sure moms really frequent. After all, it's the first site to browse for pregnancy and baby books. Plus, friends have been generally satisfied about shipping and how their orders have been handled.
I believe Amazon also sells previously-owned copies and you can register or work (like blog reviews) for Amazon gift certificates. That already saves you on book expenses and you'd still get to read to your heart's content.
But do check the Manila Book Fair happening this weekend. Am sure there'd be a lot of titles there to choose from, especially from up and coming authors with fresh takes on the usual subjects.