Thanks for the suggestions. I don't need the complete tales; it's just that I see benefit from keeping both. And I kinda wanted a physical copy with both the original and the translation (because I'm just that kind of geek).
Some free ones at http://www.gutenberg.org/ebooks/author/144 . I love how many tidbits of info can be traced back to these tales (and there are some fascinating historical fiction books about Chaucer or where he's a key player).
The translations are different. The Barron's seems to be a more direct translation, which suits the interlinear format. I'll probably start with that one. It seems more beginner-friendly.
For one dollar, this looks like it might be complete:
https://www.amazon.com/Canterbury-Tales-Annotated-Geoffrey-Chaucer-ebook/dp/B01BEHF16K/ref=sr_1_4?ie=UTF8&qid=1468711886&sr=8-4&keywords=complete+canterbury+tales#nav-subnav
And there is this: https://www.amazon.com/Complete-Canterbury-Tales-Geoffrey-Chaucer/dp/1782124241/ref=sr_1_1?ie=UTF8&qid=1468711886&sr=8-1&keywords=complete+canterbury+tales
Or this: http://www.poetryintranslation.com/PITBR/English/Canthome.htm
As the miller told his tale
That her face, at first just ghostly,
Turned a whiter shade of pale"