I have been doing some Princess wine price comparisons.
Emmolo Savignon Blanc $68.00 ship, $23.99 Total wines
Markham Merlot $78.00 ship and $27.99 Total wines.
Miraval 'Cotes de Provence' Rose $74.00 ship vs 19.99 Total wines
Ouverture by Opus one $580 on board and $149 at Total wine
Even with the $20.00 corkage fee it seems cheaper to bring your own aboard with those markups. Less the two bottles for in room consumption. I am not a huge wine drinker but.....