In the US here, don't have any ID except for my student one. Pretty much every WU location also does Moneygram, so shouldn't be any extra trouble, and I'll eat the fees.
Edit: just going to get a Moneypak and put it up on the forum, nevermind
You need a government issued ID for WU if I am not mistaken (in the US, and for me at least). So a license would work. And sorry, I can't sell as little as $100, I would like to sell a minimum of 1 BTC at a time but prefer it all be taken at once.