robinreads.com
Curated daily deals to a "growing community of over 194,000 members"; accepts <10% of 100+ daily submissions; reviews are "only one factor" (no fixed minimum).
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Discounted-ebook ($0.99–$5) sibling to Freebooksy.
Cheap Fiverr-based promo blasts.
SF/F-only deals to 55,000+ subscribers.
The most selective, highest-impact deal newsletter — 15M+ opted-in subscribers; per BookBub's editorial post, "only about 25% of submissions will be chosen for a Featured Deal."
Daily free/discounted ebook deals.
Kindle deal newsletter; BookBub substitute.