The last time I needed resin, I found this place too. But, if I recall, it was also considerably cheaper than the $215 price today. That was well over 2-3 years ago. And, I got three refills out of that 1 cu.ft. bag. Even today, at $215.00, that makes it $71.00 per refill. That's still cheaper than DR spotless replenishing yours. Since DR spotless is in El Cajon CA, (outskirts of San Diego) my son just drove down to their warehouse and did a face-to-face exchange for his DRC20 and it cost him $85.80. Using advanced calculus, $85.80 x 3 = $257.40.
dirince.com has the best deal going.