So I think Topshop is priced slightly higher in the US in general, probably due to scarcity or import fees or something. I'm comparing the standalone store in NYC to the same thing in the UK here. The prices in the NYC store and on the topshop US website seem in line with Nordstrom prices, although I think topshop itself tends to have better sales.
I DO think it's a little overpriced here, and have not been super impressed with topshop's quality. I prefer H&M myself, and I think the prices are a little better too.
The marketing of Topshop at Nordies' is interesting. I think if you go to the NYC store, it's very clear it's fast fashion, along the lines of H&M or Zara, but then at Nordstrom it seems like sometimes they are trying to make it seem more high end than it actually is. (Although like I said, I don't think they are price gouging since the prices are comparable to the standalone store.)
