Hey guys! HERE IS AN UPDATE: I've made a gamejolt page for what we have so far, which is barely anything. But add me on steam! It's VedFeYr we'll get some shit DONE.
Heh, I actually went looking hoping they were abandonware, but no. If you have an iPad or an iPhone apparently it's available as an app: http://kotaku.com/5970234/twenty-seven-classic-infocom-text-adventures-all-at-once-all-for-ios
But for the PC I think Amazon might be the best source. This is just a quick glance:
http://www.amazon.com/Infocom-Adventure-Collection-PC/dp/B000051ZT0
Or try just looking for Infocom on Amazon. Some of the prices are amazingly, amazingly high, but it's just a matter of digging.