We have a lot of mirror threads, but not a lot info!
Given all the money you want - but you still have to ride at home by yourself, and need to train half-passes, half-steps, and flying changes - answer me these questions:
How high do your mirrors start off the ground?
How tall do they go?
Does this change if you have them on the short or long side?
How long of a section do you want on the long side, to see flying changes?
Safety coating or backing?
Do you tilt?
Does the size of horse/pony matter?
Insulation behind them? (Indoor, but not heated. Gets cold.)
How do you cover yours?
Acrylic - yes or no?
Notable businesses - good or bad?