First, welcome to the iFixit community Sharon.
Ram is pretty inexpensive. I would visit crucial.com and select your model from their easy drop-down lists. The site will tell you the maximum amount of ram the system supports. On the mini, as mayer states, some will support 4GB.
If your model supports 2GB or 4GB, I would definitely just max it out and be done with it vs having to tear down the mini later.
I still have several 512GB chips that I've pulled from various mac mini's and Apple Laptops that I keep around. They aren't worth anything, so I just throw them in older Windows laptops for customers at no charge on many occasions.
All the members in the community are volunteers here to help with your computing questions. Again, welcome!
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