Selling items for fractions of currency.

Is there some way to list an item for say 2.5 div or 2div and some amount of ex? Like I know you can't in the merchant tab as that only takes whole numbers but in a normal premium tab you can put 2.5div just the item doesn't get listed. Same thing with trying to use fractions if it's just one of a stackable item even though it works if you had 2 and wrote in 5/2. Is the only option to just sell it in ex and than buy the div?