Clic arcade games/for PC?

Does anyone know where I can download or buy,would anyone possibly have 4 sale of know of anyone that would sell.But I'm not talking about just any clic arcade PC games,I mean the old school clic arcade games like(Galaxian,Galaga,Defender,Millipede,… Kong,Q-bert,Dig Dug)those type of clic arcade games but for PC.Can anyone help out or point me to the right direction?