This week, it's SCP hands-down, as they're coming to me in pairs also.
Usually though, it's Mears (unless you count Ebay).
Ebay sends me daily suggestions of "other items I might like, based on my purchases". I have yet to bid on one, or even check one out. As an example, purchasing a Cap Anson item gives them cause to suggest I bid on a Cap & Gown set for Graduation.
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