You really need a picture if you want an ID, preferably as many decent pictures as you can take. Several octopus species have eyespots. Hummelincki's also shine blue in their eyespots, it's just not constantly visible. It seems that either bimac or hummelincki are currently the most common species being sold with eyespots, so it is most likely one of those two. Most probable would be hummelincki.
Do the eyespots seem to disappear or at least be very hard to see sometimes? Does your octopus look "spikey" a lot? Does it have webbing between its arms?