ah , Adobe PhotoShop does not have any competition.
You can lease Adobe Photoshop for one month.

I actually want Max, Maya, Mudbox to have a leases option.
Last I looked it was just Autodesk CADs for lease.

============================================================ 

The Artist that will fight for decades to conquer their media.
Even if you never know their name ,your know their Art.
Dark Sphere Mage Vengeance