I just picked up off of eBay the INT-4, MLC-3 and MTV-7 mini rigs.
I had them all as a kid - but when I grabbed as much of my Vintage stuff out of my parents' house as I could find, the only mini-rigs I came away with were the AST-5, CAP-2, Radar Laser Cannon, Desert Sail Skiff and PDT-8.
I never had an Endor Forest Ranger - so I bought that off eBay a while ago, and the ISP-6 was always a favorite of mine so I grabbed one of those off eBay a while ago as well.
So now I just need the Ewok Catapult and Vehicle Maintenance Energizer to have the rest of the smaller vehicles/accessories that I want.
I'd love to get the One-Man Sand Skimmer, Security Scout and Imperial Sniper mini-rigs from the Power of the Jedi line, but I know those can be very pricey.
Edit: I also just grabbed a 100% complete, display-only (never-played with) condition Ewok Village playset. With all of the Ewoks coming, and the fact that I'm sure the Ewok Village playset would NEVER be re-released by Hasbro, I felt confident picking one up off eBay to give my Endor shelf something else besides the Saga Collection Endor AT-AT...
I'm going to be going for one more thing today to add to it - hoping I get it, it's something I never got as a kid so picking up this additional Ewok accessory would be awesome!
Edit #2: Woohoo! Just won an auction for the Ewok Battle Wagon - I know some people think it's cheesy, but I have always thought it was rather neat, glad to finally have this in my collection too...