I am considering

Spending £100 on a blender. It's a very good blender, but still £100. And it can't cope with heat. My brother passed on some Compliment vouchers he got from work - big corporate do like non-taxable employee rewards, even for their contractors - so it would work out about £50. That's not bad... Now I just need to find where the hell I put the vouchers. Especially because they expire soon.