I was wondering in A Stitch in Time is made of gold!
For some reason it is priced at 92 POUNDS (!) for a new copy.
Even old ones are not that cheap considering how old they are.
There is a high demand but a low supply. Ergo, the price increases a lot.
If you can't find an affordable used copy, I would suggest purchasing an eBook copy if you wish to keep the price at a reasonable level.