I remebered that when I was looking to buy this gum, it was hard to find the size.  The factory wouldn't sell it to you, but there was a distributer on the South side that had Canal gum.  I went to the distributer, and they had every size but the size that I needed.  Then one day I was at the dollar store with the wife and there it was.
The last time I was there, they didn't have any.  
I just now searched the web and all you could ever find was the gum in cubes.  I believe that this place has the right gum.  It is the second item for $2.75.  The box of individually wraped gum.  It is not the minutura singles.  The bags are similar to the dollar store, but the singles are roughly the size of a piece of Pez candy.
http://mexicanfoodsandmore.com/mexicangum.aspxHere is a picture of the gum from the dollar store.  This bag has 54 pieces.