Walmart does reduce theirs, sometimes even before they're dead.
We were in HD the other day, and there was a try of cyclamen in the trash bin. I tried to get them, but the manager said no. The grower put them there and expects them to be there 'tomorrow'. All they needed was water! The HD plant guy told me that HD budgets for $2.2 MILLION a year for dead plants. Now, you would think that some bean counter somewhere would wake up and let the stores reduce them. Buttheads!