So after inquire within's comments on the cost of public transportation in London, I was curious to compare it to what I'd known in France.

It ends up he's paying quite a bit more than it would have cost for a month in Paris, unless you get the student discount, which is considerably helpful. The current rate in Paris is about $62 USD a month without the student discount, with it's : $36 USD. The weekly pass I purchased in April cost me about $18 USD.
In Metz, the monthly bus pass cost about $40 USD, I think; though with the student discout it was $30 USD. I never had to buy the monthly pass as I didn't bus around Metz all that much.
The best I've ever seen was Toulouse, where the montly pass for the student was $25. Though Toulouse (600,000) is rather isolated, and you tend to go there only to study, live, or work, and it's really just a massive uni town. But still, a simply great city to live in!

That's it- I was really just advertising the greatness of Toulouse.