A few people had discussed this in the past so I thought I would mention this in case anyone was still interested.
Sofirnlight agreed to sell me the SP36 MCPCB with 4 Samsung LH351D 5000K for $7.36. If you’re thinking of upgrading your XPL2 SP36 this seems like a pretty good deal.
They just created a new link to make it easier to purchase so you don’t have to send them a custom request.