Sony car speakers

We are raising money for a friend with terminal cancer. Starting with a penny we are trading things up, always increasing in value. We now have these speakers to trade and wish to swap for something worth more than around £30-£40. We don't mind what the next item is but want it to be something desirable to a range of people ie a bike, a guitar, a telescope etc. Have a think, get creative and let us know. Thanks!

I am open to ALL SWAPZ