Check out some incredible and unexpected bootleg LEGO minifigures - Heroes Assemble by Sheng Yuan - coming soon to eBay for cheap (or if you can't wait and want to pay a little more or buy in bulk, available now on AliExpress.)
This first batch may seem a little 'meh', until you get to the lower right hand corner. Yes, kids, that's Red Robin in BootLEGO minifigure form! Also shown is movie Hawkeye, yellow Deadpool, and Phoenix. Not sure how these will be bundled when they come to eBay, but I'll take any Marvel also-ran to get my hands on that Red Robin!
This next batch shows Beast and Ant-Man, along with Green Arrow and a masked brown costume Wolverine! None of these are 'must-haves' for me (I already have the Decool brown costume Wolverine) but I wouldn't mind owning all of them, so I'll wait and see how I feel or how they are bundled when they hit eBay.
Here's a batch that I will definitely try to get: Comic book Hawkeye, Galactus (!!!), Cyborg and Nova. That Galactus is just incredible and probably will never be seen in an official LEGO set.
Finally, Sheng Yuan has bootlegged the recent GameStop exclusive Plastic Man, a minifigure I would love to own. This batch also includes Daredevil, Loki and Magneto. If bundled in this manner, I may pass and just try to get an official LEGO Plastic Man, since none of the others really appeal to me (and since I already own a Decool version of that Magneto.) EDIT: I just noticed Plastic Man has elongated arms and legs, unlike the LEGO version. Looks like I will have to pick this one up after all!
These should be popping up on eBay really soon, so keep your eyes peeled. In my experience Sheng Yuan makes some top quality bootleg LEGO minifigures, and while many of these may be available in official LEGO form, some aren't and probably never will be.