I just read your post on that forum;
I found this right above your post.
170925 AGA-20G 24x12x16 HI BK TANK
170933 AGA-20G 30x12x12 LNG BK TANK
170941 AGA-29G 30x12x18 BK TANK
170976 AGA-55G 48x13x20 BK TANK
170968 AGA-40B 36x18x16 BK TANK
Also, when they told you the 33 was in a combo, this is correct. The combo includes the tank, top and strip light. You can't buy just the tank, but this combo WOULD be for $33 if it was on sale again, it doesn't seem like it will be