Cost of replacement orthodontic retainer?

[WonderWombat]

Daughter (19) has lost one of her two retainers and so far it hasn't turned up. (Though as she lost it in her bedroom it really ought to be findable..)

Any idea of how much a replacement is likely to cost?

Her orthodontist is away until after the New Year - and daughter is away for a week from the 5th Jan. So it may be that if the retainer doesn't get found, she'll have to sort this out with a new orthodontist in the town where her university is...

[TheMortificadosDragon]

I seem to remember DD's being something like £70 but I might have got that wrong.

[bijouxxx]

My DD's was £65

[WonderWombat]

Thanks!