The usual places where you can get them...SLS book corner, Book corner at Ikea Alexander, Borders and Kinokuniya. The other places are usually hit and miss. Occassionally you can find astronomy at popular but S&T is increasing more difficult to find.
The Boldly Go Where No Meade Has Gone Before Captain, RSS Enterprise NCC1701R United Federation of the Planets
I subscribe online as it was cheaper than buying off the shelf...
[80% Steve, 20% Alfred] ------- Probability of Clear Skies = (Age of newest equipment in days) / [(Number of observers) * (Total Aperture of all telescopes present in mm)]