The attached link does not have much info that you can access at this point but my understanding is Grices has special production runs of guns made that are normally not available thru the manufacturers. I seem to remember some special 35 Whelen offerings in a recent flyer. If you call the number on the site you may get lucky.

http://www.gricewholesale.com/shop.php

They move an astronmical number of guns thru that shop and order in large enough quantitys to have special runs made.