All you can do is keep watching the sellers websites and see if they have a sale. Many items by the big manufacturers have MAP pricing which doesn't allow a seller to put their products on sale without manufacturer approval.... naively a price gouging and fixing scheme disguised under the concept to "maintain product name integrity." I can see this for items to maintain resale value, but with our profession, it's just highway robbery!
I try not to support companies who require MAP pricing on dustributors!