TBLP is an Indigo Online Bestseller

I was browsing on Indigo today when I noticed an “Online Bestseller” banner across the top of TBLP. I have no idea exactly what it indicates, beyond I suppose that sales lately have been strong. I’m curious to know what it really means and have e-mailed Indigo in the hopes of finding out. In the interim, I’ve certainly no complaints about being tagged as an “online bestseller.” I guess the Leacock Medal honeymoon continues…