9x18 Makarov is easy enough to find... Here's a link to Midway's selection... You can order and have it delivered to your house... I've gotten a lot of ammo this way... usually have to sign for it when it comes (age thing because it's ammo). Midway is fast and reliable.
http://www.midwayusa.com/find?&sortb...ensionid=10056
I've read some internet testimony and watched a couple YouTubes regarding P-64's... Sounds to me like they're reliable but snappy... Nice size for carry... Have a rather difficult trigger pull... Seems like not a great range gun but a viable carry alternative. 9x18 is a very respectable round... between .380 and 9mm in strength. I like it a lot... LOVE my CZ82 which is a little bigger and heavier than the p-64 (32 oz. loaded w/12 rds.). Here's a link to a recent thread about them:
http://thefiringline.com/forums/showthread.php?t=466675
There have been recent threads regarding P-64's too... use "SEARCH" if you want to browse them. There's one going right now:
http://thefiringline.com/forums/showthread.php?t=469743