Minisforum offers an additional $ 20 off coupon code, which is shown in a banner on the UM350 product site there. The code 9QNPYHSCXPQK is valid until 9/11.
You can apply the code for all variants, the price of $ 249 is for the barebone version, which means you still need to add RAM and a SSD.
DDR4 memory is quite cheap now and there are many great deals here on SD for SSDs.
It supports both a m.2 as well as a 2.5" SATA SSD. For the RAM you need SODIMM sticks like they’re used in laptops.
Minisforum UM350 Barebone PC: AMD Ryzen 5 3550H, Radeon Vega 8 $249
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Hi, I found this deal for a barebone MiniPC: