So I went in and looked up and down the meat counter, and no sirloin roasts. I went back to get a copy of the advertisement, to make sure I was remembering/had written it down correctly. Yep, boneless sirloin. So I asked the butcher.
"...maybe you can help me find this special?" *pointing at the ad*
He said "Oh, it's right here," and led me over to a display of....boneless top round roasts.
Now, I remembered the cookbook diagrams of a cow with the cuts delineated, and I said to him, "I thought the sirloin and the round were from different areas."
His reply was "Oh no, they're the same." As I gave him a look of patent disbelief, he added "It's all connected."
I didn't argue any further, since he clearly wasn't going to budge, but I shall be writing to Safeway about this, since my cookbooks all agree that the sirloin is cut from the LOIN (surprise, surprise) and the top round is cut from (guess what) the ROUND...which is also known as the hindquarter and is NOT in any way the loin.
I mean, c'mon--my foot is connected to my leg, but that doesn't make it the same, now, does it?