Hi,
you basically have two options:
1. Get the cheapest "android tv box" with an Amlogic S905 or S905X SoC off ebay and hope for the best.
Pro: price, those cost as little as 33€ incl. shipping from within the country here on ebay.de. Even cheaper if sent from the far east.
Con:
- no support, neither for the hardware (good luck when there is any defect) nor the software (the included Android is usually buggy as hell and there are often no updates)
- rather dubious hardware quality (board components, hdmi socket, power plug, wifi reception, emmc speed,...)
- the same brands, model numbers and labels are used by several makers or vendors for very different hardware, so any tests or reviews are mostly useless. You never now what "clone" you get
- your money is supporting "fully loaded kodi" advertisers, making life for the kodi project harder in the process
2. get an officially supported device with an Amlogic S905
Pro:
- proper vendors, with support for hard- and software
- officially supported by the libreelec project, with a larger user base
- well-defined hardware quality (all devices are the same, no different hardware sold under the same label)
- your money is supporting vendors that actually contribute to open source, kodi and libreelec
Con:
- price. The wetek hub is 99€ incl. shipping here. The odroic C2 is cheaper (50€), but you may need extra parts (case, power plug, remote)
- to my knowledge, there is no such device with a S905X SoC. This means no hardware support for VP9 codec and HDR displays