I recommend getting the oversized KO. It's deluxe size. I even had one customised as G2 Hooligan. I have oversized Wrecker Hook, Wingstun and Wrecker Hook as well. The deluxe size suits them. Bit hard to find though. I was lucky enough to find a shop years ago that sold them for 2 euro each. I really regret not buying several of each for repaints as the Machine Wars guys, RID Towline and BW Dirge and Thrust. Slag, I can't believe that's 7 years ago.
R-Blade is a bit loose but the others are great. I love deluxe Wingstun. I like to imagine he's G1 Waspinator and that Wingstun was Waspy's pre Beast name. They are hard to find but usually reasonably priced. I know the Toyhell site had a few. More than Meets the Eye (but less $) Go into the Unlicensed Transformers section and scroll down until you see Robotmasters Supersized. There are normal sized versions above that but they're KO's of varying colours if you're interested.
you could try posting here. or try different search terms, such as: transformers Robot masters robot masters delta seeker RM - ## anything pertaining to the toy. just be careful where it comes from as sometimes you win and nothing gets sent :/
I got my R-Blade a little while ago from a misnamed eBay auction. Though he is pretty small, he's a pretty awesome figure and the color scheme really fits the mold. That being said, I rarely see them on eBay but did notice a few of the oversized KO. Just go on eBay and type in "Robot Masters" or "Robotmasters" and they should show up. Only problem is that they can be quite expensive. Like I said, I won mine from a misnamed auction and no one was really paying attention to it. I got mine for 10 bucks, but I've seen them go for as much as 60 (which, admittedly, I don't think it's worth).
I got.mine for about 25-30. just used the saved search feature. I know eBay mobile has it so you'd think regular would too. again check the buy trade sell threads.
You can get an oversized KO cheap. ROBOT MASTERS TRANSFORMERS KO WHITE & RED NEW ON SEALED CARD FIGHTER PLANE | eBay