There are vendors that sell mana potions, and there are a number of other in-game items available:
1) Medium Eberron Dragon Shards, from Davyd Turner gives a Shard Trinket of Mnemonic Enhancement.
2) Draught of Sparkling Apple Cider from Villager Commendations, that gives a little bit of mana back over 20 seconds.
Not to mentioned all of the ways in MsEricka's guides:
Guide to in-quest spell point recovery, and Reducing spell point usage.
Regardless of the new raid mechanics, it's the new end game raid, and players should be prepared to consume a few resources.