A lot of domains with .biz extension are in expired lists,
just check them for yourself. There is today backorder ideas:

Namejet expired:
IAGI.net 1994 PR2 * iagi
PMKI.com 1996 * pmki
MexicanVacation.com 1998 PR2 DMOZ * mexican vacation
SaoThai.com 1998 * sao thai
TokyoPortal.com 1999 * tokyo portal
CartoonSketch.com 2001 * cartoon sketch
HotelsClub.net 2001 * hotels club
LifeHost.net 2001 * life host
LearningStation.net 2001 * learning station
PopularDrugs.com 2001 * popular drugs
ClubMauritius.com 2002 PR4 * club mauritius
MauritiusDirectory.com 2002 * mauritius directory
MauritiusInternet.com 2002 * mauritius internet
CanadianLand.net 2002 DMOZ * canadian land
UsedYachts.net 2003 * used yachts
HairExpert.net 2004 * hair expert

Namejet delete:
Internet-Kiosk.com 1996 * internet kiosk
PrintMasters.net 1998 * print masters
JeansWorld.com 1999 * jeans world
MySupplements.com 1999 * my supplements
Magic-Colors.com 2000 * magic colors
Jewelry-Shop.net 2002 * jewelry shop
CoolClouds.com 2002 * cool clouds
DSYL.com 2002 * dsyl
BushFood.com 2002 * bush food
My-Ringtones.com 2002 * my ringtones
CELH.com 2002 * celh
DutchMilk.com 2002 * dutch milk
MusicLesson.org 2003 * music lesson
MedicalMarijuanaStore.com 2004 * medical marijuana store

Godaddy expired:
IndianJewelry.com 1997 * indian jewelry
IndianJewelry.net 1998 * indian jewelry
MediaVerify.com 2000 * media verify
HongSoft.com 1999 * hong soft
WebCamera.biz 2001 * web camera
Ago.biz 2001 * ago