As the prior poster indicated, indeed you can and my office does this - contact your local corporate VZW store. They overnight you one piece of paper -- the CAL license code.
The trick is getting/keeping the product code since many of the VZW reps (consumer side) wont know what your asking for (YMMV) making this a bit more time consuming (at least the first time). I think a BPS and BES CAL is the same, IIRC. That may help the rep.