I got a nice little pair of opera glasses (the technical term for theatre binoculars) for Christmas one year. Apparently they were from a very exclusive boutique called e'Bay, so if you know it at all, it could be worth a browse.

Failing that, a nice little pair of binoculars from any camera or similar shop would do the trick. They'd be stronger than opera glasses so better for those trips where you're REALLY FAR from the stage, but to be used with caution if you're not *that* far back. You can often still rent the horrible red plastic ones from seat backs for 50p (inflation

), or you can buy your own pair from the National bookshop for... I forget the precise price but think it's in the region of £4. But if you're a regular theatre-goer, it's probably worth the expense of getting a decent pair of either opera glasses or binoculars, instead of using nasty cheapo ones.