Nah your going about it all wrong. Save up for it. She dont even have to know then.
$5 or £5 each week, you'll get there thats how i did it.
I think I showed her it on the net and said "I'm getting it, but I dont wanna make us struggle so i'll only put aside £5 a week. i know it will take ages for me to have enough to buy it but I wanna do the right thing by us so we dont have to struggle"

Cunning as a fox