If it's like the standard 80% lowers I've seen from big operations you can complete it with a drill press.
I know a guy that did one with a hand drill and a dremel. Ain't pretty but it shoots reliably.
I've shot an AR-10 that had a 80% lower finished with a hand drill. It definitely wasn't pretty but it did the job. Considering how all the gun regulation bills were killed off(that I know of) I imagine we'll get back to 2012 prices soon enough. Just something to consider.