what is the best anti virus/malware programs to buy for Mac OS 10.95

None, unless you're concerned about Windows malware. Instead, you should install any security updates which Apple releases for it, and avoid downloading software from sources other than the Mac App Store and the developer websites.

(143105)

you don't need any anti virus for OS X. But if you are using dual boot (OS X and windows) you will have to install an antivirus on your windows os partition .

Niel's answer is correct, but if you feel you must have an antivirus program, the one below seems to not interfere with the OS as some do.

ClamXav

There are no viruses that can attack Mac.OS X. So, anti-virus programs are selling a cure for a disease that doesn't exist. And they are renowned for borking Mac systems.

A Mac can pick up malware but not if you just use common sense. You really have to actively invite some malware in for it to happen. That means downloading and knowingly giving your password for it to download. Mac provides all the protection you need with SIP (System Integrity Protection).I About System Integrity Protection on your Mac - Apple Support

If you do happen to download adware you can use MalwareBytes to get rid of it. Malwarebytes was developed by one of our own colleagues here in ASC. It gets rave reviews and is about the most proven anti-malware software for Mac. If you use torrents, don't. Torrents are a good way to pick up malware because anything can hitchhike in on a download.

Safari pop-ups are different and easier to deal with. In Safari 9.1 and later just close the window. For earlier versions force quit and hold the shift key while restarting Safari.

https://support.apple.com/en-us/HT203987

Finally, stay away from programs that purport to "clean your Mac". They can do damage to your system. Your Mac needs no cleaning in the first place. All the cleaning that is necessary is taken care routinely by OS X.