Here is an example of a good deal. And at regular price online currently. They usually have them in the catolog for $19.99, slashed to 9.99.
I have purchased diamond blades over the years from a variety of sources but none even comes close to Harbor. In China there must be quite a few industrial diamond plants in competition and Harbor being a direct importer offers prices that are plain silly in comparison to traditional supply chain handling and markups.
I have found that though these blades do not last quite as long as some premium blades, the cost per cut ratio is unbeatable. They really to hold up and work even at $3.33/blade.
4'' DIAMOND BLADES (3 PK.)
Their Dry Segmented Blade:
Arbor: 5/8''
Maximum speed: 14,500 RPM
Wet/dry turbo blade:
Arbor: 5/8''
Maximum speed: 14,500 RPM
Wet continuous rim blade:
Arbor: 3/4'' with 5/8'' adapter
Maximum speed: 13,000 RPM
ITEM 46152-1VGA
P.S. They are getting quite a selection of diamond tools. I recently purchased diamond paste for lapping from them, three siringes, fine, medium, and course 50% off at $5.
$9.99