Sig Sauer Romeo5 feedback and price?

I think I've settled on topping my Ruger 22/45 Lite (Mark 4) with the Sig Sauer Romeo5. I like the reviews and the versatility of the red dot sight. However, I have seen prices ranging from $120 here at Palmetto State Armory:
palmettostatearmory.com/sig-sauer-romeo5-1x20mm-red-dot-sight-black-r52001.html

to $250 locally (central Indiana gun shops)!
I'm looking for some feedback (reviews) and any input on the reason for such a price range!