When shopping online, don't forget shipping costs. Some sites with free shipping, the product cost more. Some if you spend a certain amount, shipping is free.
How about other dealers? I own a Dynasty, but here, the Hot Springs/Cal dealer has by far the best price on Dichlor. The Sundance/Jacuzzi dealer is the only one carrying the filter cleaner I prefer and 303 products. I get the brand of MPS I like best from Doc's site. Fortunately, I work near the two mentioned dealers.