No, don't do it. Buying bags on credit? No way.
If you don't have the cash, then sell a bag you don't use. Or get one or maybe two - then get the third when you can afford it. There will be new bags around all the time, bags you want, need, desperately have to have...
And even if you could afford them right now - are you really going to be able to appreciate & really enjoy 3 new bags at the same time? Don't you think one or two might sit in your closet, unused? That would spoil the fun....
My advice would be to take the time to enjoy each bag - there will be more deals coming up, and more bags to long for!!!