Can someone please give me some tips on how to get curly/wavy hair?

i have naturally straight hair, so i tried scrunching with a lot of Aussie Sprunch spray, but it takes me over 5 minutes to achieve the curly/wavy style i want, and i have to do it before i sleep. i cant invest in rollers or irons, so can someone list some drugstore curling creams or mousses to achieve this look? : a href="http://www.glamourhair.com/images/pophairextensions/HH-ClipIn-Extensions---Wavy.jpg" rel="nofollow"http://www.glamourhair.com/images/pophai…/a