Danielle,
A suggestion: A good way to get in with MAC is to audition for their freelance team. This is a position they offer where you are placed on a list of people they will call when they need additional help either for launches, or if they are short handed with staff. They call you and ask if you can work and if you can't it's okay you just tell them no. I have been freelancing for MAC for about a year and I LOVE it. It works for me because I have a full time day job that I can't give up right now (otherwise, I would take a permanent position with them in a heartbeat). If you do well and work well with them, they can consider hiring you as a permanent employee when openings come up. I have been approached a few times and have had to turn them down, much to my dismay! I've established a great relationship with my local freestanding store, and so they tell me weeks in advance when they have hours so I can plan ahead. They also work with my schedule (Available evenings and weekends) and offer me shifts during those times first. If you could get them to work with you that way and save shifts for you that were at times that your husband was available to watch the kids, you'd be set. Pay for freelancers is at the low end of the pay scale for a perm. employee (so not much different).
If you are interested in freelancing for Mac, read up on some of the threads about it here on Specktra! The audition is not easy, many people do not make it their first time (I was one of 4 people out of about 30 selected from my audition). I credit my success to all I learned from the peeps here on Specktra. They have open freelance auditions about 2-4 times per year, depending on your area.
Good Luck!