As for S4, it was on sale for 672 gems from March 20 to April 3. I don't expect it to drop to 480 again, but somewhere within the 600 range is reasonable for the next sale. The lowest S3 has been is 480 gems and last September it was 624. Each complete pack is 960 when not on sale. Seasons 3 and 4 are ones where you will need to own the content to even access the maps they come with (6 maps each). Obviously you won't get rewards/achievements if you don't actually own it yourself) This is the ONLY season where this works. And story instances in S2 can be shared with friends as long as the host owns the content. (8 episodes, technically added 2 maps but they are accessible to ANYONE. The lowest it's been is 640 last September. Season 2 Complete Pack is normally 1,280 gems and the most recent sale (ran from March 20 to April 3) cut it down to 960. There are complete packs within the gem store under upgrades- > Living World. I'll say that in most scenarios you will NOT want to buy individual episodes for 200 gems.
