BM Dress Price?

I was looking online one of the BM dresses that I like, and I see online theprices range from about $130- $180....Now I know these are different prices than I'll get at the store, but I was just wondering if I went someplace like Lillettes w/my BMs approx how much would it be?

Would it be closer to the lower end or higher end? I just don't want my girls to have to spend too much.

this is the dress: http://www.billlevkoff.com/#/9/product/1166/434