No suce thing as free delivery, it's all inlcuded in the price £81.
Back to the question rohm had supplying problems, resulting in suppliers always being out of stock. Just remember mixed bed resin will always be at the bottom on the production line as number one is resin for power stations.
A lot of suppliers have now changed brands.
If you look at Wintecs they are out of stock, this will happen regularly as mixed bed resin is about 5% of production. The problem comes when demand is bigger than production, guess what will be at the end of the production schedule. This is fact hence why Rohm are having problems.