That link you posted for OEM must be a mistake. If you notice, that 400mW you posted is cheaper than lesser rated lasers on the same website. I think that is a price for about 325mW. Compare these two links...
http://store.oemlasersystems.com/index.php?main_page=product_info&cPath=6_52&products_id=406
VS.
http://store.oemlasersystems.com/in...h=6_52&zenid=9e5720a1ed522482759cc296a3304c5b
If you notice on the second above link there is another 400mW priced much higher. The cheaper 400mW laser is out of order.
http://store.oemlasersystems.com/index.php?main_page=product_info&cPath=6_52&products_id=406
VS.
http://store.oemlasersystems.com/in...h=6_52&zenid=9e5720a1ed522482759cc296a3304c5b
If you notice on the second above link there is another 400mW priced much higher. The cheaper 400mW laser is out of order.