If you're new to HSN, you can try promo code NEWHSN
(YMMV). If you aren't new (or don't feel it is worth the effort to create a new HSN account) and you haven't used it already, you can use code SHOPHSN
to get $10 off. Also if you haven't used the HSN app, you can use code WELCOME10
to get $10 off. Finally, if you're a new customer and you're placing a larger order, you can sign up for their e-mails and get 15% off your first order.
On top of all that, you can use Flexpay and pay $14.99 (or less with any discounts) a month over 4 months.
IMHO this is the best printer/scanner/copier as far as cheap replacement ink. Here are three examples since people always ask with these deals:
6 sets of ink for $15.80 [ebay.com]
6 sets of ink for $16.95 [ebay.com]
6 sets of ink for $16.98 [ebay.com]