I just sold a 30lb anchor not more than 2 days ago. Was a navy type anchor, more for rocks than sand is what buyer explainded about type of anchor when purchasing, guy was a retired commercial fishermen as said rock type anchor are rare and hard to find. Actual weight was 28lbs. Was that the type anchor you were looking for?
Outdoor Emporium had a bunch of steel pyramids in stock a couple weeks ago I think they had a 25 and 30lb. I went the cheap route and put 30lbs of steel plates from goodwill on an I-bolt. $15 and it works great.