Picked up Super C, Little Mermaid and Strider this week. I definitely overpaid for Super C ($30) but I had the cash to swing it, and it was in good condition.
Super C
Man, I forgot just how solid an entry this is in the series. The most solid, maybe. Though I do like the series for the most part (Well, the 2D entries), the series started shifting from run and gun platformers to run and gun boss rushes with occasional platforming between (Which came to a head in Hard Corps, and again in Shattered Soldier) and I prefer the better balance that the first two games, Operation C and Contra 4 strike in regards to that. It helps that this and Operation C have the best secondary stages in the series, too. Not too big a fan of the faux 3D stages in Contra 1 and 4, or the overhead stages in III. The ones in Super C don't drag on and overstay their welcome.
Strider
I guess playing Strider NES is appropriate seeing as how Strider 2014 takes an open ended approach to it's design, something that Strider NES also did. It's a fun game (On what I believe is the last area at the moment), but man are the jump physics glitchy. Not game breaking, but really finicky. One touch I really like is that going to the password screen brings up a TV Show esque recap of what you did last, and even ends with a "See everything, next time on Strider!" like tease. Really like that frames the game's plot.
Little Mermaid
It's hella short and pretty damn easy, but damn is it fun to play. I love the mechanics of the game, and looking for every item/treasure to maximize my score makes it a pretty fun game to play in short bursts. Gotta love that classic Capcom touch.
The store I got Super C from also had Gradius for $20, and Castlevania III for $14. I plan on getting Akumajou Densetsu at some point, but I wouldn't mind having CVIII for the sake of completion, though I believe I wouldn't be able to play it on my AV Fami because MMC5 titles don't play nice with converters.