Point Blue does have similar use to the other products mentioned. They are not identical as the above post might imply.
Prochem doesn't tell us what is in there Dry Slurry, but I don't think it would happen to be the same as Point Blue.
When you are only using 1/4 to 1/2 oz per 5 gallon stock tank for your rinse, I don't think small differences in price are worth shopping around for. Point Blue is $33.80 for a 7 pound jar, but with the coupon from the mail you can almost get it for free this week.