I don't know about the ink replenish program as I still purchase as I need via sales, coupons, and recycle vouchers. It's NUTS how they sell this ink, but must come from some data showing what needs most frequent replacing. I've found aa 2 different combo packs - but still not with each of the 6 required as the purple is always left out. I don't fully understand why there are 2 BLACK !! (one large, one small) needed either unless the small blends somehow with the colors to make some other color. It stinks to have to purchase any single ink at a full price. I think one has to figure out what kind of printing will be done and decide what inks you will need and stock based on your individual printing needs. Good luck. Hope this helps.