I came to the forums to see if there's anyone discussing this. I share the OP's frustration.

Neon lights definitely come from the level 100 18 hour ventures, DoW/DoM only. Stone Partitions I thought were from submarine missions? Maybe they're from both though.

I'm on a new world and there have been ZERO of these on our MB, I've had two retainers running the proper expeditions and have not received any of them. On other worlds on Dynamis the Neon Wall Lights are going for millions of gil, despite really needing at least a few for any logical usage, and as far as I know there has NEVER been a Stone Partition on our MBs. It's punishing new worlds and anyone without a ton of gil, when there's ALREADY gil sinks in the game (large houses, various mounts, etc).

And for the most part the people already doing ventures are the ones doing ventures for this: you need a leveled up battle retainer, you need to KNOW that these things come from ventures (meaning you looked them up separately), etc. And most people into housing are probably running ventures at least some times for some of the older ones that have rare mat drops for expensive housing items. And I sincerely doubt ventures are THAT unpopular that they needed to do this and the extremely low drop rates make it likely most people would give up, anyway.

I mean, I NEVER get the housing dungeon drops, I've run some of the dungeons so many times I can barely stand to look at them, but at least then they'd be on my MB's for semi-affordable prices.