In message , Andrew Chesters
wrote

She's not winding you up!! There is quite a range of size an price.
Maplin might be a good place to look, or CPC. Both have on line
catalogues but you need an account for CPC,
I've just ordered another 128Mb from CPC for £20 or so.

CPC have two payment methods. If you pay by card at the time of ordering
you don't need an account with CPC. However both Maplin and CPC appear
to be expensive for flash drives (UBS). I've recently purchased a 128M
device for £8.50 (incl. p&p) from ebuyer.

(Whether this is the best price I don't know,

A few months back it would have been a good price. I've seen 1G flash
drives for around £50.

One thing the OP should note that kids passing data at school is a good
way to get a virus. A virus checker that is constantly kept up-to-date
(perhaps daily) would be a good idea.
--
Alan