For people who read Christian fiction, I just spotted this offer on the front page of the US Kobo site (may not apply in all regions; ETA: also on the Canadian front-page once I turn off the VPN IP proxy).
30% off any book by the Baker Publishing group (imprints include Bethany House, Revell, Chosen Books, Baker Academic, etc.) with coupon code
Baker30 until April 23rd, 11:59 EST. One coupon per customer.
They are also offering discounts (probably price-matched in other stores) for 1st in series Baker books starting at $1.99 (and up to $3.49, discountable also with the regular coupons). Several of these titles have been freebied in other stores previously, so check the Deals forum or your archives to see if you have it already.
Details and links to the Baker imprints can be found on this Kobo
special promo page.