Whats up with out of stock dob telescopes?

A friend of mine started talking to me recently about astronomy, and long story short I noticed that almost every single dob 6"-12" is out of stock until like the end of September. Why is this? Mostly looked at Orion and Zhumell, and noticed that several of the open tube designs are still in stock, but none of the enclosed ones. Open tube feels risky to me as logically it would seem thay any stray light into or through the tube will wreck the image being seen.