Hi Sam,
We have bought the Multitech Conduit (210L - mLinux, non-cellular) - it is under £400.
We are also building the €200 DIY gateway: https://github.com/mirakonta/lora_gateway/wiki
...again this is based on the Multitech LoraWAN card.
You can see our efforts at ttnreading.org
Cheers, Mark