I don't remember where I saw this, but ICSI UK is offering L500 off the price of their Certified Network Security Specialist (CNSS) training. https://www.icsi.co.uk/courses/icsi-cnss-certified-network-security-specialist-covid-19

At checkout, use voucher code #StaySafeHome and the price becomes 0GBP.

Note that I've never heard of this organization nor this credential, so read the site in detail and use your own judgement.