need help finding coin

my peace dollar set is comming together nicely. i have all yrs and mints other than:

1927 p

and d

also 1928(yes the bad boy)

trying to find at a resonable 175-250$ but cant seem to do so:(

the sad part is i think im going to have to raise more money for a better looking.all the other peace dollars are ms(im hoping)dont want to mess that up by adding 2 nasty coins under the ms grading.

can any 1 help?

i mainly work with diamonds(willing to trade valuable rings)