Hi Thaymis,
According to the color charts I refer to, Humbrol 122 was marketed as Israeli Light Blue which has since been discontinued as you alluded to. There are however other paints that could be substituted for the 122 below:
Humbrol 122 Israeli Light Blue (discontinued)
Federal Standard Color Reference: FS35622
X-Tra Colour: X149
Polly S: PCI877
Gunze Sangyo: H314
Testors Model Master: 1722
The following link bring you to Urban Frederiksson's Color Reference pages. Quite a handy compilation of paint info:
http://www.ipmsstockholm.org/helpdesk.asp#color_charts
I hope this helps.
RODC