Best Place To Get a Step-Down Transformer

[ryancrl]

Hey guys.

Looking for a step-down transformer for my Mesa Mini Rectifier from the US.
I'm looking for 3 main things - 500w, Good Quality & Best Available Price
I'm thinking of Sim Lim Tower but do you guys know of any other good places? Maybe Adelphi?
Need a good transformer so that my head doesn't get harmed.

Thanks for the help!