The Ectaco jetBook Lite supports DRM-free ePubs but for DRM-ridden ebooks you need to buy eReader ebooks. The Aluratek "Libre" E-Book Reader Pro and Astak 5" EZ Reader Pocket Pro support DRM-ridden and DRM-free ePubs and PDFs.
B&N ebooks can either be eReader or ePub with a DRM scheme incompatible with most ePub Readers. So you can't reliably buy from B&N for any of the three Readers you list. Two popular stores for US ePubs are Sony and Books on Board, but there are now many US ebooks stores offering ePubs. Almost all UK ebooks are ePubs. It is also possible to strip DRM from Adobe ebooks (see the same blog as for K4PC), and these ePubs are then usable on the jetBook.
You can buy Kindle ebooks via Kindle for PC, strip their DRM with unswindle.pyw, and format shift to DRM-free ePub using Calibre. This approach is viable for all three Readers, and is probably legal in the US for personal use of ebooks your bought. The only thing to watch out for is that some Kindle ebooks are in the TOPAZ format which is significantly more difficult to format shift than the AZW ebooks handled by unswindle.pyw.
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