Sherri Hill, Blush Prom, LaFemme, and Jasz Couture dresses for cheaper prices?

I am looking for these Sherri Hill dresses:
#7208 Strapless Peacock Princess Ball Gown
#9204 Backless Graphic Print Prom Gown with Train (this one comes in different prints that have different style numbers and are different prices)
#3400 Sweetheart Babydoll [...]

Where can I find a skirt kind of like this cheaper?

I was shopping today at Express and saw the cutest skirt. I was going to buy it but then I realized it was $50. I saw one like this last year at forever 21 but they ran out quickly so I never got one. Can anyone tell me where I can find [...]