Wow! This is why you always snoop around discount comic bins! I haven't collected Teenage Mutant Ninja Turtles comics in ages, but I just happened upon a ton of back issues of the original 80s comics I never managed to find as a kid.
All three issues of Return to New York, the issue with the fight in April's antique store and the subsequent one where they get to the Northampton farm house (both adapted almost in their entirety in the original film), the first appearance of Leatherhead, first appearance of Complete Carnage and Radical, the issue with the nuclear plant and the mutant fish people, and - most importantly - the three-parter by Rick Veitch that'll never be reprinted because of rights issues!
A couple of these I already have via collected hardcover or paperback editions, but for a dollar a pop? Amazing!
... And speaking of anthropomorphic animals and martial arts the 35th Anniversary of my all-time favorite comic, Usagi Yojimbo, is this November. To celebrate, the all new Issue 6 from IDW will be a remake / expanded version the original 8-page Usagi short story published in 1984!
Even the cover is a remake of the cover of Albedo #2!
What makes this really neat is that that first story is kind of important to the overall saga, but it was also made when Stan was just fooling around and making his first comic stories and he didn't plan on this series consuming his entire life so from the point of view of hindsight there are certain things that are a bit inexplicable about it it can be expanded on or explained.