Current pricing (what it would cost you to buy) of the least expensive 1921 Morgan would be at a coin show in condition, VG $31, F $32, VF $33, XF $34, AU50 $36, AU58 $38, MS60 $39.
Half the price/cost of the 2021s'.
The decent 'coin show' here occurs monthly ( 2nd Saturday), free admission. The vendors/tables are competing for your business so pricing can be variable.
I watch for (contingent on price) Morgan dollars, Peace dollars, Ike dollars (silver only, no clads), Franklin halves, Kennedy halves (90% & 40% only). Conditions I'll buy range from VF to MS60. I don't buy a lot, maybe only 1 or 2 coins per show.