I think I am the man in my relationship, I buy the b/f's stuff.
It's tough to find nice boarding pants for cheap. Best bet is use the steep and cheap tracker and wait. They have had the odd great deal on there.
Does she like bright colours? I just love the new Volcom stuff. I can't justify the expense but damn its nice.
Pretty much every online shop has deals you just have to look. That's the fun part isn't it?