Amy Winehouse

help buying rare earth magnets?

Well.. whenever i go the mall i always see those rare earth magnets. However, I feel as though they are cheaper, lower quality magnets. Im looking for ones of at least N42-N45 grade.
I dont know much about magnets, but do you know the quality of the magnets at the stores? I know N35 is a low quality, do you think thats the strength of the ones in a Brookstone?
Is there going to be a huge difference between a lower grade vs one a bit higher?

Im mainly looking for

-a place to buy/order strong magnets
-difference between grades
-if possible, the quality of the magnet balls (in a cube formation) are they typically N35?

Sorry for all the questions, thankyou