How do I buy more riven slots?

[(PSN)B0XMAN517]

I feel like I'm asking a stupid question, but I can't find an option to buy more riven slots. How do I go about doing this?

Edit: Thanks for the answers. If anyone stumbles upon this thread, you are also given an option to buy more slots if you get a riven from a sortie and have no room for it.

Edited October 31, 2017 by (PS4)B0XMAN517

[Ozais]

you get them at the market but i think the max is like 90 slots

you can look for them by typing riven in the search tab

60 plat for 3 slots

Edited October 23, 2017 by Ozais

[-AoN-CanoLathra-]

60 per 3 Riven slots, max of 60 slots. Found in the market (search riven)

[Ozais]

nvm it was 60 idk why i was thinking 90

 

[-Kramer-]

It has been recently (U21.6) increased to 90 slots following this logic : 30 for primary / 30 for secondary / 30 for melee.
 

 

Edited October 23, 2017 by Kramer17

[xXDeadsinxX]

It’s in the market, you can buy more slots in the market. You can get to the max of 90 riven mod slots