Via Joystiq, I discovered that GoGamer is offering Doom 3 for $30 as part of a 48-Hour Madness Sale. That sounded like a good price, especially since most other stores are selling it for $60 or so. But, before ordering, I first checked ResllerRatings to see whether it was worth buying from them.
As it turns out, GoGamer has a 6-month rating of 7.50/10 along with a “Gold” Elite Customer Excellence Award. That was good enough for me, so I placed an order. And, shipping was only $5.99 for FedEx 2-Day (bringing the total to about $36). If you’re thinking about ordering one for yourself, just keep in mind that there are about 12 hours left in the sale (as I write this).