Upgrading from Photoshop Elements 6 to 7.0

[sarahdavis]

Hi,
I'm wondering if anyone can tell me the easiest/best priced way to upgrade from Photoshop Elements 6 to 7.0 - My husband bought me 7.0 today not realizing that what I already had was 6.0....I don't want to mess with mail in rebates, etc., but if I save $40 or so by taking it back and upgrading then I'd definitely rather do that - however I'm fighting with my sons to go to bed, my daughter is screaming, and I don't have time to search the web (right now it feels like I may never have the time again *L*) So if anyone did this with good results and can tell me, I'd really appreciate it!!!!
Thanks,
Sarah