The 1903 Morgan Dollar is a very common coin thanks to numerous bags that have appeared on the market over the years. PCGS alone has certified over 13,000 examples of this date, with most falling into the MS64 to MS65 grade range. Superb examples are very scarce, but can be found occasionally in auction sales and in dealers' inventories. MS67 appears to be the last accessible grade.
Prooflike 1903 Dollars are very scarce and Deep Cameo Prooflike 1903 Dollars are almost impossible to find.