Usually whatever I see on Amazon's DotD stuff will inevitably show up in my eReaderIQ filters, so no, I don't typically bother. I do periodically browse Kobo's
Deals page, though, because sometimes stuff shows up there that I haven't seen flagged elsewhere. That's where I picked up the Budayeen Cycle from.
My only complaint is that the "____ genre books under $5" section doesn't seem to distinguish between books that are
on sale and books that have a listing price under $5. That bugs me, because it results in books like
Hyperion being perpetually in the Sci-Fi deals section, because the book's listing price is $4.