Eddy, here's a closer source for Surround- http://www.7springsfarm.com/catalog.html. However I don't think that control will be satisfactory if Sevin had no efficacy for you.
Imidan is restricted in some states for use in residential areas, meaning you have to be licensed to use it but it is not restricted here for agricultural use. Most states it's not restricted at all and is legal for homeowners to use.