These are partially new, offered for more than 1000 €. Is just the difficulty whom to find the ones needed. That's why I can well imagine that you have to go down there with the price, if you want to get the man. But first I would offer you for free. Can still go down with the price.
But there has been someone to find. 128GB, only a hoster or someone with a workstation can start something with. Also technically seen (CPU and Mainbord have to support that)
If you find someone, then we have been working as Germanils said with some computer. And just go on it! Imagine a pin breaks off ..
If you find someone who needs them, you can certainly get much more than 1,000 EUR (for all together).
That is 128 GB Server RAM, accordingly a lot of value.
Probably a single one of which is worth 200-1000 € :)
How To Hell Do you come to something ???
For something like that Are there any well-known sources of information called eBay & Co. or also relevant forums!