Help.! Fashion disaster!?

Ok so i just turned 13 and this saturday is my yr 8 disco!! I yotally forgot about this so i spent heaps of my savings on bikinis and shoes but no dresses! I have now only got $28 and i have seriously tried sll the shops in town but theyre all so ugly! So im choosing to buy online. It needs to be able to ship to WA unlike stupid american shops like forever21 and so on. Dont get me wrong i seriously love forever21 fashions but it doesnt ship to WA soo yerr. They need to be cheap- $20 cheap and pretty but not to skanky. I would appreciate any ideas as long as it ships to WA!! :) plz help!!!