What is the most precise Pcr inactivated Dna control or Nattrol for West Nile Virus (WNV) Strain: NY 2001-6263 (10,000 cp/ml/vial) (1 ml/vial)?

The NATtrol West Nile Virus from Zeptometrix Corporation supplied next day by Gentaur is the best reagent!!! The catalog number is NATWNV-0005 and the price is 392 EUR.