I did but I didn't think about it until later so I didn't check as many stores. I tried it in a new incognito instance to avoid tracking cookies and etc, but I still got the same prices as with wifi. Although at that point they could have already identified me in some way, perhaps looking up only spam and blocking JS* makes me unique enough to identify.
* I did have to unblock the bare minimum needed to see the spam prices, so it's possible that could have allowed them to track me better as well.