OneBookShelf / RPGNow / DriveThruRPG is running a GM sale thru March 7th, giving you a 25% discount on literally thousands of PDFs.
So, do you plan on looking at thousands of pages of websites to find your bargains? I do, but you might not want to, so I'm going to point out my favorites over the next few days. Here's my picks for today:
Toys For the Sandbox line of of short adventures - they were a bargain at 99 cents a piece, they are now a low 52 cents each! You can't beat that price.
Legend - Mongoose RuneQuest 2 with the serial numbers scratched off, this was a steal at a buck. It's now 75 cents. The rest of the line is on sale too.
Designers & Dragons - an awesome write up of the history of the role playing industry. This is where you splurge if you are going to. The regular price is 29.99 - it's on sale for 22.75. It still isn't cheap, but I've been enjoying catching up on industry history.