Occasionally, boxed copies of Adobe CS6 (the last perpetual version before Creative Cloud) appear on eBay. Ensure the seller transfers the license properly — but expect to pay $300–600.
Some resellers still offer unused CS5 perpetual licenses, but prices can be high ($200–$500). Note that Adobe’s activation servers for CS5 still work, but you must own a genuine key.
Using or distributing cracked Adobe software violates copyright law. While individuals are rarely sued, Adobe does pursue large-scale distributors. Moreover, your ISP may flag torrent traffic, and employers risk severe penalties for using unlicensed software.