@Brit: If you're asking me, the only S&B 9x18 I've used is plain ol' ball and it runs perfectly fine, same as about everything else I've put through the Bulgie.
Of the relatively few brands of JHP I've tried, the Hornady Custom is simply what showed me the most reliable expansion in the limited types of media I had readily available to do my quasi-scientific testing with from my pistol. Cor-Bon and some of the other "boutique" loads are rarely seen in these parts, and way too pricey for me rationalize buying off the 'net to do much playing around with, seeing as I don't carry my Mak for SD. If the results of more sophisticated testing from credible folks in the trade mags show enough of a demonstrated perfomance advantage to the new "Critical Defense", I'd be inclined to get a couple of boxes for "just-in-case".
I don't know your situation in Oregon, but where I live there's no state or local law that prevents me buying any and all the ammo I want over the internet and have it shipped directly to me. If you do some shopping around, I'm pretty certain that you can find a lot more options at prices you can afford. Natchez Shooters Supplies one of the first places I look, as I've dealt with them many times over the years and never had a bad experience with them. There are lots of other options, too and I'm sure others will chime-in with theirs directly.
FWIW, on generic ball practice ammo there's nearly always some significant savings to be had if one can purchase in 500 or 1,000 rd. lots. The difference is more pronounced with high-volume sellers such as 9x19, .40 S&W and .45 ACP, but does generally hold true none the less.