Stamina potions are another option, though I've discovered through trial Tera Gold and error that these will only be usable before the Spell-weaving ability is activated, so ultimately they're of limited use but still worth a mention.
The Vile Ambrosia spell cast by the Demon Slave familiar is perhaps the best overall source for natural stamina regeneration, and is quite effective at helping to counter the stamina drain effect while weaving. Once you reach level 60, I highly recommend picking up the 'Hell's Blood' feat found on the Conflagration tree.
The feat on it's own is definitely worth the two points spent for the bonus to all types of regeneration granted by Vile Ambrosia, but to give you an example of the difference it can make while weaving, at level 60 with no other buffs active beyond the Demon Slave's spell I'm able to maintain Spell-weaving indefinitely without ever seeing a major loss to stamina.
Here's what the increase to Vile Ambrosia looks like with 2 points spent in Hell's Blood at level 60 - the top line for each entry is the base increase of the spell, with the second line being the added benefit through feats.
