Build a wide input, wide output switched power supply pre-regulator
Bench-top power supplies with transformers are heavy and expensive, especially when they have to be able to provide a few hundred watts. Furthermore, such designs are old school. Today, using switching configurations it is possible to design 250 W PSUs that accept at their input anything from 85 VAC up to 265 VAC and that weigh less than 500 grams. This particular design is even open source.