Man I wonder how much it will take to craft barrel bombs. When a random team and I were at 14 minutes Nergigante went to sleep and ate 8 of those at once and died immediately lmao. I guess that won't happen often in the final game.
LBB is usually cheap. Whenever I sleep a monster online someone always has a bomb or two handy. People only break out the LBB+ on a serious sleep bomb run because they usually take annoying fish materials.
The 3DS games you could get 'sale days' from the shops by just cycling quests but in Tri you only got half price stuff during the Jhen event. I'd imagine this will be similar where people will wait for a certain day to stock up on things like bomb materials.