Hi,
Yes. The first one is an example. I cannot be certain the second has replaceable components and suspect it doesn't given the small packaging.
Note, the 2800W version MS2812 might also suit you. They share the same case as MS2012 and I'm certain other components.
My only concern about that seller is his / her ratings. 94% on ebay isn't high. There are some noted cases where they didn't pack the item properly. But ebay offers purchase protection. Just read carefully before you bid. Still, a PITA if you have to return.
I bought mine (MS2812) for $800 from ebay and can't remember if that included shipping.
Here's an example of a good seller or at least a more promising one. You might email them if they'd convert to a best offer. No bids on theirs @ $999.
You will also need a magnum remote to configure for LFP. But they aren't expensive. Another $100 to $200. Used, probably less.
Hope that helps.
Doug
Really appreciate it again. A bit above my price range, but I do like the BIFL philosophy.