There are two types of "Small" soulforges. One of them is a 2x2 tile piece and looks a lot like the center piece of the large soulforge. It is a deco item released during the primeval lich champ spawn. This item is deco only and can not be used as an actual soulforge.
The 2nd type is a one-tile item that comes from Scalis. This one is functional and can even be placed on a Brit Ship and used there. This one comes in deed form and when placed, it looks somewhat like the Elven Forge without the upper 1/2 .
Recently - the Primeval Lich deco drop has been going for the 55 mil range but the functional Scalis version goes for a lot more.