D2R: +3 to all skills items?

Are there items in the game, besides from uniques and maybe sets, that grant +3 to all skills?

Highest I found so far is +2 from blue or yellow items.

I know that there are items with +3 to all e.g. summoning skills for the Necro and I guess that's mostly the better choice, but I just wondered if could stop to manically check the merchant every time I am back in the hub, because maybe I won't be able to find those bonuses,

Thanks in advance for any advise!