At Whose Time?

I regularly read the blogs Unnecesaary Quotes , LowerCaseL, and Apostrophe Abuse, all of which are composed of pictures of handwritten signs submitted by readers. I only wonder why there isn't a blog (as far as I know) that collects pictures of typos.

I spotted this sign at the Goodwill store in Hollister, California (where I live). Notice the line that says "However at his time, we are unable to process any gift card transactions." Obviously they mean "...at this time..." but accidentally left off the first letter in "this." Even though I knew it was a mistake I could not help jokingly thinking to myself, "at whose time?" LOL.