I went into my local Poundland today and found they are selling vintage or antique light bulbs for only £1. These normally cost a lot more - on eBay they sell for £5-£8.
The brand is called Oasis Antique Bulbs. I don't know if it's nationwide or not, and it's not on the website. Thought if anyone's looking for a vintage bulb you may like.
I got this image from another site - not my own.