Yes as a late comer to CW/UW I had a bit of a tough time. So I'm glad I got UW-05, otherwise, you are still looking to pay $30+ for a loose Voayager Optimus or $50+ for one MIB. It's almost the same situation with Hotspot, though a bit more economical.
I was at a Target in the bay area a couple of weeks ago, an they had 4 Silverbolts in stock which kind of surprised me. I know they are plentiful on HTS TRU & places like BBTS, but hadn't seen one in a store in a while. I'm guessing Cyclonus lack of popularity is due to not having a dedicated team in the U.S., same with Scattershot (most fans probably held out for the Computron set)
BC Optimus & Motormaster have been released twice and are plentiful. Onslaught & Scattershot are plentiful, and Sky Lynx being a tail ender is very difficult to find (thought I did finally get one at TJ Maxx)
*edit* just checked BBTS. They still have every CW Voayger in stock. Sold either in pairs, or individually, EXCEPT for the standard Optimus Prime. Sure he's one of the most popular characters but that being the case, Hasbro usually produces him in much larger quantities (like Bumblebee in other series/assortments). I wonder what Hasbro's thought process was with Voayger producing less? Maybe because they thought...since they were releasing 2 Voyager Primes, that both would be equally sought after
Bucket/Want List: Botcon 2016 Customization Class Ratchet (G2 Deco), or Customization Class Ratchet (Marvel Comics Deco) **would also be willing to pay for an Unpainted Botcon 2016 Ratchet, TT Legends Fortress Head (only) with working Electronics
Wish List of Modern Combiners: Road Caesar, Monstructor & Dinoking (proper size to fiction), Landcross, Guard City, Battle Gaia, & G2 Defensor. Wish List of Titans:Metrotitan,Majin Zarak