Thats the thing with lockerz, you dont do serveys. The only ways to get points are to Log in, answer the dailies and invite people xD
http://talkprizes.com/ <---their "fan" forums
http://www.facebook.com/pages/LOCKERZ/80976158596
and they update in their facebook as well
the cheapest thing they have is the Ipod touch skins which are 15 points, many type of usbs for 40 all 2gigs and then the have Games for many consoles for 100 points. that's just the small stuff xD
just stick to the site and you'll be getting prizes