Hey Lee, if they are not re-seals then I would say £20 for the nikto as long as the bubble is really nice without dings or dents.
The Romba is a fairly common POTF carded figure. I would say maybe £45 if the bubble is in good shape.
These prices could g up or down by maybe a fiver either way depending on condition mate.
As for the Bib Fortuna it aint worth much. You might get £7 for it if it is minty with it original card and bubble on ebay.
Hope this helps, Chris. 8)