Popular

We were actually in pursuit of a greeting card to send to someone for their birthday. Unilocal guided us to this bookstore.
On a Sunday, we had to make it through the maze of sales guys pushing condos before boarding the escaltors to get to the 3^rd floor, but other than that, the bookstore provided what I was looking for. Not a big selection of greeting cards, but some.
This store is half bookstore (not in English for the most part) and half gift/​office supply store (wrapping paper, notebooks, pens/​pencils, pads, toys, themed product lines of stuff, music CD’s, puzzles, etc).
Not a bad bookstore, but not the best either. Seems to be a chain of sorts.

Popular is a chain bookstore that originates from Singapore and has locations in several Asian countries and Hong Kong. This location is on the third floor of Pioneer Centre in Mong Kok.
The store is moderately sized, not on the scale of Eslite. The books sold here are in Chinese, but some of them (ex. cookbooks) have English translations in them. I did not see any magazines or newspapers, so don’t come here for those.
They do carry a selection of music and DVDs though it is not on the scale of HMV. Though these days, the selection there is getting smaller. And the offerings do not seem to be the most current.
Since I can’t read Chinese and the entertainment selection did not appeal to me, what garners three stars is their selection of stationery. The stationery here seemed mostly imported from Japan or Japanese inspired.
What appealed most to me is their selection of imported Japanese pens. There is plenty varieties to choose from and they have test papers for you to scribble on to see if the pens are for you. They are slightly marked up, but not by much. Certainly not double the price like at one bookstore here in Seattle.
If you are looking for Japanese stationery, check out Popular. It is the main reason I would come here.