Yeh, the 200 isn't very good. The 64 is better. I still have some frozen K25 that I also am saving for special occasions. I send mine to Dwayne's in Kansas. I checked out Rocky Mountain's site. What a rip off for processing. I only pay $6 for a roll of 24 exp, or $8.50 for a roll of 36 at Dwaynes.
Rocky Mountain wants $27.50 with shipping for 1 roll or $51 for 2 rolls. With prices like that no wonder nobody shoots Kodachrome.

Check out Dwayne's web site:

I have had good results and great service (plus it is the only place I know of where I can buy fresh Kodachrome Regular 8 movie film)