In 2019 this wouldn’t be a good deal, in 2021 this is a very good deal.
Solid basic 2 MOA red dot which IIRC is made by holosun. This isn’t a replacement for an aimpoint/eotech/ACOG but it’ll be fine for the average Joe.
Is there a shortage of red dot sights too?
Yes. The Romeo 5 was $110-120 in 2019 at places like palmetto. Like everything else, demand for inexpensive AR optics and the supply is limited. Supply chain is still having issues for everything coming out of China.