Do you value the concurrence feature to such an extent that its worth paying each year? I never found the concurrence features very useful or that effective, they seemed to glitch sometimes, perhaps because I was using multiple displays. In any case, if this isn't a must-have feature for you, have a look at virtualbox as it's completely free and works really well as a window on your usual osx desktop.
https://www.virtualbox.org/ I used parallels for quite a while but i was so careful to ensure that the security vulnerabilities in windows didnt get passed over to the mac workspace that i ended up using parallels as if it were a ringfenced virtual box. When i realised that, it seemed like a no brainer to just use virtualbox instead. I found there was sufficient integration between the two OS (copy/paste etc) to meet my needs. You can watch a ten minute youtube video to work out how to install windows (or many other OS) into it and then you are up and away. Doing the whole install probably took me fifteen minutes, no more. It's a nice halfway house between bootcamp's entirely separate environment and parallel's kinda-integration.