I have a steam gift left over from the purchase of Orange Box, and the only people I would normally give it to have it already so. First person to give me $10 gets both.
You will need to setup steam & a steam account by going to steampowered.com and creating an account, at which point I’ll give it to you once. And you can download/play it whenever you want.
PC only obviously, as steam isn’t used on other platforms. 
Or best offer if we are going to get all cut throaty like. 