It's a reasonable question but all we can offer are our experiences and personal views. I had two of these, one to wear and one to sell. I sold the spare about three months ago for £225. I was happy but they all seem to be around the £300 mark now. If by retail you actually mean in a shop then I believe the RRP in the UK was £129.
That's the state in the UK. I'd expect prices to be a little cheaper in the US as they nearly always are.