Birdman Brewing (a HBT sponsor, I believe) has download codes for the PC/Mac version at a discount price.
I spend far to much time doing price comparisons before buying pretty much anything and his was the lowest I found for Beersmith when I bought it a year ago. Looks like he hasn't increased his price since then. He sent my code in less than 24 hours.
Glad I could be of service! I've found this software to be very helpful in formulating recipes, even though I still do my brew-day note taking in a paper journal. It took me a while to figure out how to use it (I didn't find the interface terribly intuitive) but play around with it for an hour or two and check out some of the guides on the Beersmith site and it will start making sense.