I personally do, and I'm trying to get a computer, disconnected from my PC and hooked up somewhere else.
malc0de and Malware Domain List are pretty excellent sites to get started on downloading malware.
WARNING: DO NOT VISIT ANY OF THE LINKS ON THE SITE ON YOUR REGULAR COMPUTER. YOU RISK DESTROYING YOUR PC OR GETTING LOTS OF VIRUSES.
Please, just use a virtual machine or a computer that isn't even on the one you normally use. AKA another computer.
Go get one from Goodwill, I don't care.
Aside from that, anyone else got any good database sites or old computers I can buy to test them?
Thanks.