The turtle bun is a must get at Bakery Nakamura! Located right at Steeles and Woodbine inside J-Town, Bakery Nakamura is located inside a grocery store.
There's always fresh buns available for people to purchase - tons of people come by to purchase them whenever I come, so I would say it's guaranteed fresh. The green tea turtle bun is $2.50 and is a signature item of this place. Their other buns range from $1.20 per piece to $4, so it's more expensive, but debatably worth purchasing as well - if you're up for the types of buns they sell!
Bakery Nakamura also sells donuts, sandwiches and danishes as well as cakes and desserts. See if you can stop by on a regular weekday to be able to purchase some delicious baked items.