It depends on your country. The method varies a lot depending on your location.
But if you offer WU and other non-reversible methods you will find somebody to sell.
The sad thing is that Western Union is very difficult to use in my country.
If you can share your country we could help you better.
Otherwise you can use localbitcoins without providing your ID. You'd be less trusted but if you use escrow you'll be fine.
Okay. Thank you for the help. I will speak to some people in real life about Western Union and I will also give localbitcoins a look. Locking the thread.