I found a Blood Money tie on eBay. Sure, it may have some additional light blue stripes, but it's as close as I'll ever get.
It's an Ike Behar, made out of silk and bought it at a measly 15€ (+10 for shipping). Small price to pay for this unique tie.
Needless to say, it will be my tie of choice when I play any HITMAN game in the future.