I was going to post this as a deal, but due to the seller not being a 'Top Seller' on eBay, I couldn't.
Malwarebytes Pro has just moved onto a subscription based model for their software and so it now costs about $27 a year for a licence. I found some sellers selling a lifetime licence for Malwarebytes on eBay, starting at $9.08 aud. 100% feedback with 854 sales seems like a good bet!
The next cheapest was AU $14.29 with 95.5% positive feedback.
Both sellers will message you a key for Malwarebytes. I already own Malwarebytes Pro, but I was looking to get a few more licences for some friends and family.
If you don't run Malwarebytes alongside your anti-virus, you should. Malwarebytes is like a wingman for your antivirus!
Pretty good price, cheaper than when I bought mine.