The Final Fantasy 11 AH was kind of fun to play around on.
You could only sell in singles or complete stacks Singles and Stacks had individual listings You could see what the last 10 sales were (seller, buyer, when and price) You could not see the listing prices, you entered what you were willing to pay and if someone listed at or below your bid, you got the item The item with the lowest listing price always sold first
It really made a game out of the AH, you could spend time and find the exact listing price, but it would take an inordinate amount of time. Or you could bid 1 for items to see if someone was listing them a that price.