I give you little chance that you can buy it locally in UK or Germany.
I suggest to order a RAK831 here: https://www.aliexpress.com/store/product/RAK831-LoRa-LoRaWAN-Gateway-Module-433-868-915MHz-base-on-SX1301-Wireless-Spread-Spectrum-Transmission-range/2805180_32832894046.html for some €106 including shipping.
In the Netherlands one has to pay additional 21% VAT and €13 handling fee, around €36 additional costs (or nothing if you are very lucky).
In case you could buy it locally in Europe you would have to pay the VAT anyway.
"and waiting a few weeks": You can’t have both cheap and fast. 