According to one rep at BB, they're supposedly not getting any more copies of NFL Street once they sell out of it.
At least, for the XBox and GC versions, since they're not showing up on the website anymore, and the SKU is coming up as a deleted SKU in their system.
Same here, Wapcaplet - I just hope one of the local BBs here has it in stock. Thanks OP for the info, and to Strider Turbulence for the PS2/Xbox word as well.