First come, first serve. I found these in my laptop bag and thought I’d offer them as a giveaway here on my blog.
These expire August 28th, 2012 — though I assume someone will use them before then. I think they’re only available to Canadians. If they don’t work for you, chances are someone else typed faster than you did. Sorry!
Click to embiggen them if you want.
See also: How to redeem a code in the iTunes store
If you’re too late for the free copies of Instapaper, I’d still recommend picking it up for only $2.99 in the App Store if you haven’t already. I use Instapaper every day to read articles from various blogs and websites.