UberEats promotion code update:
8/5/2022: you can try to use the code EATS40F55 or EATS40FLZ –40%off up to $15 on orders $25+, limit 3 times.
I do believe these codes only work for delivery order.
Recently, Paypal has another promotion to get the Uber one at the very cheap price, you can check out the promotion here.