It would probably cost you about the same to buy mine and post it as it would for you to buy new it's only a cheap stick off Amazon (£14) But the Sonoff ZigBee usb is only £19 on Amazon which has better range.
CC2531 Zigbee2MQTT Firmware with Antenna for Home Assistant, Open HAB etc. https://www.amazon.co.uk/dp/B085MFRK9W/ref=cm_sw_r_apan_i_FJXE8SCD34YAXVCSZ8P8?_encoding=UTF8&psc=1
No worries, I've got a pi in my loft with one of these attached cc2531 added some sonoff light switches too