I find sometimes it can be hit and miss, I've found some cheaper options (generally) have been great before now and lasted but if you use them heavily then I wouldn't expect them to last as long in a decent condition.
For offers on Sketchers themselves, have you got a QVC outlet or Sports Direct near you? Have had Sketchers on really good discounts from there before now.
Wyndsor's World of Shoes (or something like that) had a sale on when I went by the other day and I'm sure I've seen Sketchers in there before now.