I've noticed that too. I think a lot of it has to do with this year's bike shortage and the number of people having their old bikes fixed up and people fixing bikes to sell and 7 is possibly the most common freewheel out there as it has been in use so long. WalMart was still selling bikes with 7 speed freewheels as late as this past year I know so there's a gazillion 7 speed bikes out there. I have worked on several bikes for people and done a few to flip this year and almost all of them were 3 X 7 MTB's and hybrids or 1 X 7 cruisers and most of them had broken shifters. As the season progressed I found 7 speed shifters harder to find and more expensive when I found them. The same for freewheels, of course I didn't have a single 7 speed on hand but I had several 6 speed freewheels and 3 X 6 and 3 X 8 shifters and never needed any of them. I also noticed descriptions including freewheel in the description for 7 speed cassettes from a lot of the sellers so if you didn't watch closely you end up buying a 7 speed cassette. I had to do a lot of searching to find Shimano 7 speed freewheels at the "old" prices, the few mainstream US sellers that had them had doubled their prices. Even Sunrace, Sunlite and generic Chinese 7 speeds were getting scarce and pricey. Delivery times have been about twice as long too so my garage was jammed up with other people's 7 speed bikes waiting on me to find reasonably priced parts and then a couple weeks for them to come. I wonder what Spring will be like. Fortunately I've upgraded most of my index shift bikes to 8 or 9 speed with cassette hubs and those 7 speed I haven't already have new freewheels and shifters.