Any VIS collectors out there?

At a local thrift store a whole bunch of sealed games showed up:
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I did a little research on-line and found some cool information about the system and games, but the problem is desirability and rarity. I ended up buying the following three:
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For $5/each it is what I felt like gambling with, but a majority of the titles are educational. I doubt dropping $100+ on the rest is worth it especially since I have yet to see a system to even play them on. I suppose there are dumps of Modular Windows installs out there to drop on another Tandy system or emulate. Anybody know what these are even worth?