Eva Longoria, 49, loves this L’Oreal root spray and it’s on a rare discount — just $8

Finding gray hairs are growing in faster than you’d like? Well, you can shell out — big — for a salon treatment, risk touching up your roots at home or invest in a root touch-up spray for the days you want to look and feel your best. For Eva Longoria, the solution is simple: L’Oreal…