Tachyon Publications has a coupon for use in its store for physical books, and I believe that also for ebooks.
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From November 26 until the end of the year, use the coupon code BLKFRI2021 site-wide for a 20% discount, with free shipping within the United States. If you can't wait that long, use our 15% coupon, THANKS15, good for right now until then
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Apex Book Company is offering 40% on all titles when you use the coupon
BLACKFRIDAY2021. Offer valid through Monday.