I am building a Flyback DC/DC converter for my Power Electronics class and I would like to know where can I buy the coupled inductor.

The calculations of the design are as follow (ideally):

Vin = 24V

Vo = 12

Switching F = 100kHz

Pout = 1W = Pin

Iout = 83.33mA

Iin = 41.67mA

N2/N1 = 1:2

Duty Cycle = 50%

I want to operate the converter at 50% and use the coupled inductor to step down the 24V down to 12V.

The coupled inductor calculations are as follow:

Lm > 72mH

L1 = 1uH

L2 = 0.250uH

R1 = 1 ohm

R2 = 0.250 ohm

I cannot find the coupled inductor with a turn ratio of 2:1. Can somebody help me find the coupled inductor?

Thank you.