Flour millers typically offer their stronger flours as bromated or non-bromated, such as General Mills Full Strength (12.6% protein) and Remarkable (13.6% protein) as I am sure other flour millers do. If you live in California, it may be difficult to find a bromater flour because, as a potential carcinogen, all products containing KBRO3 and sold in California must have a warning label similar to that which is found on a pack of cigarettes or a bottle of wine. In Canada it is not approved for use in food, but anyplace else you should be able to find it. If you can't locate it at a local store, or buy it directly from a distributor, you might be able to talk to a local retail baker to see if he will sell you a partial or full bag, or maybe you can place an order for a 50# bag of bromated flour with his next flour order. FYI: Full Strength W/bromate (#53391 or #53381); Remarkable W/bromate (#57140 or #57122).
Tom Lehmann/The Dough Doctor