Reddit mentions of 8Bitdo M30 2.4G Wireless Gamepad for the Original Sega Genesis and Sega Mega Drive - Sega Genesis,Black

https://www.amazon.com/gp/product/B07HB1XFQW

8bitdo recently released a new version of the M30 2.4G that comes with a USB receiver: https://www.amazon.com/dp/B07XPHP57T/ref=cm_sw_r_cp_api_i_-rUVDbJK68CPT

You can also get the version of the M30 2.4G with Sega Genesis receiver and combine it with a Raphnet adapter: https://www.raphnet-tech.com/products/db9joy_usb_v2/index.php

and

https://www.amazon.com/dp/B07HB1XFQW/ref=cm_sw_r_cp_api_i_vAUVDbK3NW9KV

This second option is twice as expensive, but it lets you use your controller on both PC and Sega Genesis.

It is available for pre-order on Amazon

I recommend one of these. https://www.amazon.co.uk/8Bitdo-Wireless-Gamepad-Original-Genesis/dp/B07HB1XFQW/ref=sr_1_1?crid=KI7869CC2U0Z&keywords=8bitdo+megadrive&qid=1571502081&sprefix=8bitdo+mega%2Caps%2C136&sr=8-1

They work and feel great, for best results you will want to upgrade the firmware on both the controller and receiver(requires opening it)

This should do it.

https://www.amazon.co.uk/8Bitdo-Wireless-Gamepad-Original-Genesis/dp/B07HB1XFQW/

I hear the 8bitdo m30 2.4ghz version is very good.

linky link link

(It is wireless though so may not be suitable for speed running due to latency)

Edit: added more info.

Sick! So it is!

Just gotta wait for them to start selling them in Germany now. I see their other products around so hopefully it won't take long for this one to spread!

https://www.amazon.com/8Bitdo-Wireless-Gamepad-Original-Genesis-Drive/dp/B07HB1XFQW

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https://nerdist.com/article/sega-genesis-mini-6-button-controller/

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the 8 button is most sought after for future mods, i don't recall anyone selling sega branded ones(yet). buying the console from amz japan is only option right now for sega brand 6 button

8bitdo 8 button (best brand my opinion)

https://www.amazon.com/8Bitdo-Wireless-Gamepad-Original-Genesis-Drive/dp/B07HB1XFQW/ref=sr_1_3?keywords=8bitdo%2Bgenesis&link_code=qs&qid=1567709732&s=gateway&sourceid=Mozilla-search&sr=8-3&th=1

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or 8 button "retro-bit' officially licensed for the mini:

https://www.amazon.com/Retro-Bit-Official-Controller-8-Button-Raspberry/dp/B07P37ZGTF/ref=sxin_2_ac_d_rm?ac_md=0-0-Z2VuZXNpcyBtaW5p-ac_d_rm&crid=3PYE018YK90LD&keywords=genesis+mini&pd_rd_i=B07P37ZGTF&pd_rd_r=3d9be6b3-59bf-467d-ac97-ac823a59af78&pd_rd_w=BmPf4&pd_rd_wg=l4fMV&pf_rd_p=d29bc9bc-49e2-46b8-bc05-387917c341ec&pf_rd_r=H6G4M3XSR1BGDDF2WDVY&qid=1568908633&sprefix=genesis%2Caps%2C287