Just to comment the Gen3 slims have been out for awhile, i have just yet to see the regular gen3 though, but spec wise they are essentially the same apart from length and heat dissipation capacity just being in a smaller but slightly longer package, price wise though yeah more expensive than gen 2’s but why i was recommending them over the gen 3 was just the best bang for the buck.
As for the gen 2’s being out of stock i kinda figured that would happen but someone definitely scooped up a lot but they may and should get replenished, as for current prices i figured either they are just the cost of an older gen or were a reflection of trying to off load stock while the gen 3’s were being rolled out, but we won’t know till later.
And yeah RIU has a thread on them that has been around awhile, and you can find other builds with them over on the ledgrow light forums