Kia Orana Paige, welcome to the Cook Islands forum.
Whilst I haven't noticed any turkey bacon at CITC's largest supermarket located across from the Avatiu marina in town, I am also not looking at the frozen bacon section preferring to buy fresh bacon at CITC, or at Prime Foods. I suggest that you have a look at the frozen sections in both supermarkets just in case you are in luck.
Have you booked one of the suites at the Rarotongan with cooking facilities?
All the best for your visit. Kia manuia.
We booked the honeymoon suite & requested a microwave.