Check the list of vendors on the Remington Society of America here:
http://remingtonsociety.com/rsa/service
You will not likely find a Remington stock. I put my 722 in a Bell and Carlson stock and I love it.
The stock for this model gun can be found at cabella's
Try e-gunparts.com
Find an authorized Remington Repair center. You can find a list on Remington's web site.
Try Master Distributers at masterparts.net. The M16SC is a direct replacement. the model# is111174-01 remington / chainsaw/ replacement chain 16" #16SC
gun shop, gun show
Try e-gunparts.com
Contact Remington directly.They should be able to identify the variant of model 700 rifle you have after a brief description of your rifles stock,finish,barrel length etc.
Try www.gunbroker.com
Try e-gunparts.com
Check this page on the Remington Society of America for a list of places: http://remingtonsociety.com/rsa/service
I would go on the web,there are a lot of sights that can supply you with a replacement stock. Look here for a list of suppliers: http://remingtonsociety.com/rsa/service/ e-gunparts.com is probably one of the largest.