I received an email from Lenovo with $50 credit. Have tried purchase accessories and see there's no minimum spending requirements.
There are a number of items you can get for free. Credit applies at the payment step; you will need to apply it.
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These are some of the accessories less than $50:
Lenovo Essential USB Mouse $9
Lenovo Legion Gaming Control Mouse Pad L (Grey) $17
ThinkPad USB3.0 to Ethernet Adapter $19
Lenovo HDMI to VGA Monitor Adapter $19
Lenovo Business Casual 13-inch Sleeve Case $19
Lenovo HDMI to HDMI cable $19
Lenovo Select 14-inch Sleeve $19
ThinkBook 14-inch Sleeve (Grey) $19
Lenovo 15.6 Laptop Casual Toploader T210 (Grey)
ThinkPad 15.6-inch Basic Backpack $29
Lenovo Business Casual 15.6-inch Sleeve Case $29
ThinkPad 14-inch Sleeve $29
ThinkPad 13-inch Sleeve $29
Lenovo Select USB-A Wired Hi-Fi Headset (with in-line controls) $35
Lenovo 15.6-inch Laptop Urban Toploader T530 $37
ThinkPad 45W AC Adapter Slim Tip $39
Lenovo IdeaPad Gaming Modern Backpack (Black) $39
Lenovo Essential Wired Combo Keyboard and Mouse (US English 103P) $39
Lenovo Preferred Pro II USB Keyboard - US English $39
Lenovo Select USB Wired Stereo Headset $39
Lenovo Professional Wireless Laser Mouse $39
ThinkPad 65W AC Adapter $39
Lenovo Go USB-C Essential Wireless Mouse (Storm Grey) $45
ThinkPad Essential 16-inch Backpack (Eco) $49
How can we apply these credits? Is it as simple as signing up for a new lenovo account?