There could be a few sources these companies used to learn I was preparing to leave town. Based on my actions, I believe they included a listing on the Houston Area Realtor web site and inquiry at movers.com. I also completed a change of address form at the post office, however I do not recall the USPS sharing lists as such.
This one, although late, is interesting. It offers the prospect an immediate benefit -- a discount at Lowe's. This $10 off $50 coupon is the same offer that is made available through the US Postal Service's Movers Kit. Perhaps the cost to Allied is zero, but it is an effective way to break through mailbox clutter.
Of course, the speed in which a company reaches out to you to sell is not necessarily correlated with the quality of it’s service. My furniture was shipped by Texas Home Movers, AKA Texas Home Storage. The shipment was late, and several items were damaged.
complaint with the Better Business Bureau and took other action.
Learnings: As a business, if you purchase a hot list, use it fast. As a consumer, avoid Texas Home Movers.