Aim Surplus has a deal on complete 9mm spikes carbine rifles. $879.95, try building one for that, it's not easy to do...
http://www.aimsurplus.com/product.aspx?item=F1STU9335&utm_source=AIM+Surplus+Main+List
http://www.aimsurplus.com/product.aspx?item=F1STU9335&utm_source=AIM+Surplus+Main+List