Surely it's worth no less than its replacement cost, which is the price of the replacement keyboard plus the work lost due to the time spent getting it and plug

Surely it's worth no less than its replacement cost, which is the price of the replacement keyboard plus the work lost due to the time spent getting it and plugging it in. This is only going to be <$10 in general if you have a pile of spares right to hand, with unit cost <($10 - epsilon). Not having a spare, it'd cost me a lot more than that to replace my keyboard. Gulp. Better get one...