I just noticed a peculiarity on the fonts.com site (Monotype) that could end up making you pay more than you need to for a font. The site figures out what country you're in and displays the prices in the appropriate currency. But currencies fluctuate relative to each other, and this pricing apparently isn't live.
For example, I'm in Canada, and a font was displaying $43 CAD. Switching the display to U.S. currency, I found the price is $35 USD. But the two currencies are about equal now. It should be about $35 CAD as well.
Bottom line: check the exchange rates and compare with other currencies. You might save money buying in something other than your home currency. Not a problem paying by credit card: the credit card company will convert it to your own currency on your bill.
I've emailed Monotype about this; will post their response when I receive it.