DDR3 8gb Module

System Name	Wopr "War Operation Plan Response"
Processor	5900x ryzen 9 12 cores 24 threads
Motherboard	aorus x570 pro
Cooling	air (GPU Liquid graphene) rad outside case mounted 120mm 68mm thick
Memory	kingston 32gb ddr4 3200mhz ecc 2x16gb
Video Card(s)	sapphire RX 6950 xt Nitro+ 16gb
Storage	300gb hdd OS backup. Crucial 500gb ssd OS. 6tb raid 1 hdd. 1.8tb pci-e nytro warp drive LSI
Display(s)	AOC display 1080p
Case	SilverStone SST-CS380 V2
Audio Device(s)	Onboard
Power Supply	Corsair 850MX watt
Mouse	corsair gaming mouse
Keyboard	Microsoft brand
Software	Windows 10 pro 64bit, Luxion Keyshot 7, fusion 360, steam
Benchmark Scores	timespy 19 104

Anny one knows a website that sells Ddr3 8gb or 4GB Single modules?

System Name	Pandemic 2020
Processor	AMD Ryzen 5 "Gen 2" 2600X
Motherboard	AsRock X470 Killer Promontory
Cooling	CoolerMaster 240 RGB Master Cooler (Newegg Eggxpert)
Memory	32 GB Geil EVO Portenza DDR4 3200 MHz
Video Card(s)	ASUS Radeon RX 580 DirectX 12 DUAL-RX580-O8G 8GB 256-Bit GDDR5 HDCP Ready CrossFireX Support Video C
Storage	WD 250 M.2, Corsair P500 M.2, OCZ Trion 500, WD Black 1TB, Assorted others.
Display(s)	ASUS MG24UQ Gaming Monitor - 23.6" 4K UHD (3840x2160) , IPS, Adaptive Sync, DisplayWidget
Case	Fractal Define R6 C
Audio Device(s)	Realtek 5.1 Onboard
Power Supply	Corsair RMX 850 Platinum PSU (Newegg Eggxpert)
Mouse	Razer Death Adder
Keyboard	Corsair K95 Mechanical & Corsair K65 Wired, Wireless, Bluetooth)
Software	Windows 10 Pro x64

perhaps direct from manufacturers like say, Mushkin or Crucial?