Ike Dollars And Mint Sets

How is one to get good specimens if they're not included in the mint sets?

"Brown boxes" are proofs and "Blue boxes" (which are actually envelopes) are uncirculated.

There were no Ikes in the '71 and '72 mint sets. At the time
the mint sait they were not setup to include them and that the
packaging was ordered for years in advance. These four coins
are very difficult to find in gem (as are all the other dates)
and the '71-P is quite hard to find even in choice condition.

The uncs in the blue packaging and the prfs in the brown boxes
are all 40% silver. It's the clad issues that can be tough to
find nice. (especially '71, '71-D, '72, '73, '74, & '76 tI.)