If you would really like to try the drugstore options with the castor oil, you could perhaps try them on one section of your face for a few weeks. This way if it
does break you out, it will be minimal. Oils
are not, believe it or not, always comedogenic. Some, such as sunflower oil, are actual anti-zit. Castor is a pretty heavy oil though, but if it only contains effectively half a drop per bottle it might not be an issue.
You could try plain old witch hazel. NOT just the cheap kind though, you have to look for a brand that specifically says "no alcohol". Most of the cheaper bottles have alcohol added. I
believe the brand "Dickenson's" does not, but it's been a while since I've used it and my memory isn't what it used to be! Just be sure to read the label of whatever you buy and make sure it has no added alcohol and you'll be fine. Witch hazel is also very mild, but your skin may vary!
I actually make my own toner now and would
never buy toner again! I learned about this toner on various sites on the internet, and even though it sounds bizarre, it works so well I got over the bizarre factor really quickly

Basically it's nothing but distilled water and apple cider vinegar. I use a half water/ half vinegar dilution, but it's usually best to start out with a quarter vinegar to 3/4 water dilution and work your way up to make sure your skin doesn't have any negative reactions. That's one of the beauties of this toner, it's infinitely adjustable to
your skin. I have used the more expensive Bragg's vinegar and plain old store brand apple cider vinegar, and honestly cannot tell the difference, but some prefer the Bragg's.
All I do is fill a bottle I bought at Target for this purpose (you could use an old toner bottle, just wash it out well and let it dry thoroughly) halfway with the vinegar and then top it off with the distilled water. Shake, and it's done! I usually add a couple tablets of uncoated asprin, as it's a chemical relative of salicylic acid and it seems to help me keep the zits away. With a few drops of an emulsifier, you can add essential oils such as tea tree or whatever you'd like. It does smell
powerfully like vinegar when you first put it on, but once it dries the smell vanishes and no one will know your beauty secret unless you tell them

This toner makes my skin incredibly soft, exfoliates a bit, takes the redness out of my acne scars when used consistantly for a while, and seems to balance out my oily skin without stripping the heck out of it like store bought toners always did.
You can make
all kinds of neat skincare products at home. Even your own Creme de la Mer! This way you also know exactly what is in your products. Two websites I have used to order those weird and hard to find cosmetic ingredients are:
http://skinactives.com/home.htm
and
http://www.thepersonalformulator.com/
I'm not affiliated in any way with these sites, just a past customer. The first site in particular has some AMAZING ingredients and even give you "recipes" for some popular products.
Can't find what you want in the store?
Make it!
Dana