A lot of people ended Wrath with a big pile of gold. As we moved into the Cataclysm era, much of that gold probably went into leveling tradeskills and getting enchants on your gear.
If you are trying to gear up and you still have a fat sum of gold sitting around, here are some BoE epics that rogues might look for on the auction house.
Realistically, many of these won’t show up on the auction house for several weeks or even months, because when they drop they are being used by the lucky people that get them. Eventually these will be found by players who don’t need them and they’ll go up for sale.
Head: Tsanga’s Helm (BoE zone drop in Bastion of Twilight)
Neck: Don Rodrigo’s Fabulous Necklace (random drop)
Back: Dory’s Finery (random drop)
Waist: Belt of Nefarious Whispers (LW)
Feet: Treads of Fleeting Joy (bought with Valor Points but BoE)
Ring: Gilnean Ring of Ruination (random drop)
Fast dagger: Scaleslicer (random BoE drop in Blackwing Descent)
Sword: Krol Decapitator (random drop from pickpocketing)
Fist Weapon: Claws of Torment (random BoE drop in Blackwing Descent)
It would take hundreds of thousands of gold to buy all of them, but if you’re needing one piece to shore up your gear then keep an eye on the auctions.
This list is only epics. There are rare items comparable to instance drops available for every slot, so it is possible to completely gear yourself without running any instances if you have enough gold.