Just for information, CDNN has stopped advertising their guns on the net except to registered FFL holders. I have a copy of their latest catalog, it has Sig 225 ( (NRA Very Good to Excellent) for 299.99, or like new for #339.99. They also have the 220, (Very Good to Excellent for 499.99, and the 229 (very Good to Excellent) 429.99, or Like new for 469.99.
These are wholesale prices to a FFL. But if you have a FFL that you can work with they may allow you to order the gun on your credit card, have the gun shipped to the dealer, and the dealer charge you a small fee for the transfer. By doing this the dealer has no money tied up, and will still earn a few dollars simply by receiving and transferring to you. Ask your FFL if they have a link to CDNN, or have a catalog, or call direct at 1-800-588-9500.