A friend of mine confided in me about her homeschool experience. At 28 she's going to community college to pursue a degree, and was petrified of all the education gaps she knew she had, but even more so about the ones she didn't know she had. We sat down and started going over the things she was aware of, and I was able to help compile what we started calling 'foundation' books- ways to cover a lot of ground... Source: 11 months ago

Other comments have covered other aspects, but I used dealoz.com to get most of my books when I went to college. It's an aggregator that searches for books everywhere by ISBN plus shipping costs and seller coupons. You could sort by cheapest, transaction type (buy/rent/ebooks), new/used, etc. I just made sure to pick reputable sellers. Some the sellers host 3rd party sellers as well (like Ebay), so make sure to... Source: over 1 year ago

Been using this for a while and found great results https://dealoz.com/. - Source: Hacker News / over 1 year ago

When I was in college and buying a lot of used textbooks, I used dealoz.com, which is an aggregator that encompassing lots of different booksellers. Abebooks.com used to pop up on a lot of the searches I was doing. Source: almost 2 years ago

There are book sales aggregators like https://dealoz.com/ or even talking to other students on campus may be alternative avenues. Or even just sourcing an electronic publication. Source: almost 2 years ago

I also use the Wayback Machine at https://web.archive.org/. Source: about 1 year ago

For your course idk, but if rly dh, go to https://web.archive.org/ this is called way back machine which is used to find older version of websites. Just enter nyp.edu.sg into the search bar and select the date. Source: about 1 year ago

Rule #5 - #5: Don't link to bad websites. Use archived versions: Avoid linking directly to tabloids or hateful websites. Please use the Wayback Machine or Archive.is. Source: about 1 year ago

For those sites that have blocked the service, there's also the Wayback Machine at Archive.org. Source: about 1 year ago

In a pinch you can get access to gated Chron articles thru the Wayback machine. https://web.archive.org/. Source: about 1 year ago