Here's a link with a custom search that shows all the 70+ coupon books I currently have listed on eBay and I can combine shipping between all 6 of my eBay accounts.

https://www.ebay.com/sch/i.html?_nkw=book+coupons&_fss=1&_saslop=1&_sasl=rbakerpc%2C+rbakerpc2%2C+slotcardtrader%2C+slotcardexchange%2C+casinofinds%2C+casinotreasures&LH_SpecificSeller=1