Grauhanen - i can google and post pics of bulk ammo as well ( google cci ar tac bulk and the 375 loose round shows up)depends what you think are bulk. Is it price or the way it's packaged or what it says on the box? Is Fed AM 22, win m22 and sk magazine bulk as well?
The examples of what is generally considered to be "bulk" .22LR ammo were posted because there seemed to be some confusion over what it was. It's reassuring that people can google bulk ammo (and post pictures, too); more troublesome, however, is the continued confusion as to what bulk ammo is. Optimistically, shooters with some experience ought to recognize the difference between bulk (cheap) ammo and that which is not without being deliberately stubborn or obtuse.
To put it simply, ammo makers may make really cheap stuff, often sold in bulk packages but sometimes in boxes of 50, which usually cost a little more. Remington Thunderbolts is an example. Cheap ammo may not be always the most reliable in cycling and firing. The ammo makers make better grades of ammo, which are ostensibly less prone to failure to cycle or fire. These cost more and may be sold in larger packages to help make them more affordable. What these ammos have in common is that they are invariably not standard velocity and they are not made for accuracy. Winchester makes a number of different ammos of both kinds, from cheap Wildcat, Dynapoint, 222, 333, and 555 to Super X and M22.
Ammunition such as SK Magazine is sold in bulk packaging because it is SK Standard Plus that didn't make the cut. The difference between Magazine and SK Standard Plus is that the former did not meet all the manufacturing specifications for the latter, just as SK Standard Plus is ammo that did not meet all the standards for SK Rifle Match. If you looked at one of each, it wouldn't be possible to tell the difference between them.
As an observation and afterthought, perhaps the confusion among some shooters about bulk ammo stems from the likelihood that they have never used match ammo or even entry level match ammo. Maybe it seems too expensive or, since it's often not found in the LGS, not worth the trouble to get. As a result, shooters use what's available and find something that shoots reasonably well. They stick to that ammo and for them it's good enough. The more expensive ammo made by the North American manufacturers is almost always more readily available than match and that's what many may buy when they want "the good stuff". Unfortunately, anyone who tries for the best accuracy and has never used match ammo has shortchanged himself. It is not possible to achieve the same level of accuracy with North American made HV .22LR ammo as with standard velocity match ammo, such as those made by SK/Lapua, RWS, and Eley.