Power supply for a LED driver
I would definitely consider having a go at winding this transformer myself. The spec seems fairly decent: -



You should be able to find the cores from the usually sources (Ferroxcube, Siemens, Fair-lite to name a few) and you have specs for the inductances which can be translated into numbers of turns. You should know peak currents and be able to decide what gapping may have been applied to prevent core saturation. And most importantly, you have one or two (I presume) lying around at school - reverse engineering this transformer is not too difficult AND you'll learn along the way.

Looking further down the spec it gives you turns ratios and one I quote is 1:0.083 - this is 12:1 in my book but it could be 24:2 of course. It gets easier! The 1:0.055 is likely 18:1. The trickiest bit is working out the core material but maybe the manufacturer will help you. If you know the switching frequency you can pick a suitable core material by looking at the material specifications then this can be double-checked against the inductance and turns specified above to see if the value for A\$_L\$ (inductance factor) ties in with the choice.

Alternatively contact Premier Magnetics: -