Did you consider ordering directly from Airtronics off of their website? [link=http://www.airtronics.net]www.airtronics.net[/link] I did a quick check just now and they show all frequencies available. A lot of times distributors like Tower will be out of a particular frequency because they don't reorder just because they are out of one or two items. They may wait and order only several times a year, which could mean that they are limited on frequencies if you catch them at the wrong time. I've ordered directly from Airtronics several times and have had nothing but outstanding service.

Hope this helps

Ken