"Look for this sign in store" – is it correct?

I was wondering whether a sentence like this "Look for this sign in store" is correct. The sign in question is a wobbler attached to products in a store that includes a QR code and a discount code.

One other option I have seen online is "Look for this sign in-store". Alternatively, "look for this sign in stores" is also a possibility.

What are your thoughts? Is any of the options correct and natural for native speakers?

Thank you