The TTC has restricted the number of tokens you can purchase at any one given time to only 5. http://www3.ttc.ca/News/2009/November/0911_tokens_five.jsp
They want to curb the sales of tokens at the $2.25 rate in preparation of their impending rate increase in 2010 to $2.50 for a token.
Save yourself $125/year
Everytime you are near a TTC booth, you should buy 5 tokens. If you are a regular TTC commuter who uses tokens, you should try to buy as many tokens as you can (as you already know you will be using TTC tokens next year).
You can save yourself $2.50/weekly and $125/yearly by stocking up on TTC tokens before the new year.