That's Deep by mark. is only $8.00. I use it regularly, and I love it.
However, blackhead controlling cleansers of any sort can be very drying, so I wouldn't recommend using it without a moisturizer at least once a day.
mark. has a great blackheadeducing moisturizer, as well, for $18, called
Break Out Plan. It's really easy to get the right amount of moisturizer, too- you just push down on the top once, and the EXACT amount you need comes out the top (the first use you have to push down a few times to get any out, but after that, it delivers the exact amount you need).
They also have a fun gift set that has 3 full size products AND their travel size counterparts, but at $40 it's a little pricey for most people.
Plan of Action kit.
I have been using all of these products, and pretty much all of the mark. stuff consistently for ages (since the debut of each, actually), and I've never had a problem with any of them. I'd be happy to send you some samples if you want her to try it out... just PM me your address. Gives you a chance to try it before you invest any money in something that might or might not be right for her. My dermatologist has been very impressed with the mark. product and has started recommending their line to many of her other clients...