Xtragrl: Just from looking around online for a new MT for you:

2000 Transmission Nissan Frontier 5SPD,XE,4X4,V6,2-00 14K EB0027
$1500 Cosner Brothers - PRP, PRP-MA USA-VA(Troy) E-mail 1-800-248-6161

2001 Transmission Nissan Xterra
5-01,3.3,F-5,4X4 18668
$1500 All Foreign Auto Parts, Inc. - PRP, PRP-MA USA-VA(Fredericksburg) E-mail 1-800-533-4091

2002 Transmission Nissan Xterra XE
3-02,3.3,F-5,4X4 19151
$1500 All Foreign Auto Parts, Inc. - PRP, PRP-MA USA-VA(Fredericksburg) E-mail 1-800-533-4091

2002 Transmission Nissan Frontier
9-01,AWD,3.3,MT.,FL, XE 5K 020963
$1500 SToytown Auto Wreckers USA-PA(Stoytown) E-mail 1-800-358-8770

2004 Transmission Nissan Xterra
V6,5SP,4X4,11-04,11K 11K K0650
$1260.84 M and M Auto Parts, Inc. - PRP, PRP-MA USA-VA(Stafford) E-mail 1-800-586-5492 1-540-659-
2023

2000 Transmission Nissan Xterra
M.T., 6 Cyl, 4X4-(IPP) 999K G50009
$1250.1 LKQ - Gorham Auto Parts USA-ME(Gorham) E-mail 1-800-439-3080

2002 Transmission Nissan Xterra
-5SP,3.3,7-01 B01058
$1250.1 LKQ - Broadway Auto Parts USA-NY(Stuyvesant) E-mail 1-800-626-6708

2001 Transmission Nissan Truck
-64K MT 6 CYL EXC SC 4X4 64K K0661
$1200.34 Bruce Auto Parts - PRP, PRP-MA USA-VA(Mechanicsville) Request_Quote 1-800-552-3728 Request_Insurance_Quote

All these came from doing a search on www.car-parts.com for a 2000 Nissan Xterra 4x4 Manual Transmission in the Northeast. Hope that helps...