If you are finding a good place to get BMW EWS HU58 remote from, and not too bothered if they’re remanufactured, as long as they work okay. Why not just order from china.
I buy tools from obdexpress.co.uk and also bought 2 remote keys for BMW EWS and they are in very good condition and working well. Last 2 packages came in 10 working days via China Post. You can order via DHL and get it faster.
Link contain remote 433MHZ HU58 for BMW EWS
http://www.obdexpress.co.uk/wholesale/bmw-ews-remote-key-3-button-433mhz-hu58.html
They offer 315MHZ HU58 for BMW EWS as well. I search it out for you here:
http://www.obdexpress.co.uk/wholesale/bmw-ems-remote-key-3-button-315mhz-hu58.html