Just the one available I think. Seller also has a 400GB 1.8" S3700 for €200.
Intel DC P3700 800GB, NVMe PCIe 3.0 HET MLC 2.5" 20nm SSD SSDPE2MD800G4
Intel S3700 400GB, NVMe PCIe 3.0 HET MLC 2.5" 20nm SSD SSDSC1NA400G301
Intel DC P3700 800GB, NVMe PCIe 3.0 HET MLC 2.5" 20nm SSD SSDPE2MD800G4
Intel S3700 400GB, NVMe PCIe 3.0 HET MLC 2.5" 20nm SSD SSDSC1NA400G301