I got the cargo net for $15 on Amazon (https://www.amazon.com/dp/B0711KP3Y9?ref=ppx_pop_mob_ap_share). I don’t know that I could tell the difference between the oem one even if they were side by side.
All weather liners: get Husky or WeatherTech. They offer better coverage and are cheaper.
I have the oem splash guards but if I were to purchase them, I would have gone with Rokblokz.
I’ve gotten OEM parts from subaruonlineparts.com for well below retail. I found a coupon for free shipping.