Porcelain metal railroad logo signs

I have been searching the internet for a Great Northern and BNSF signs to decorate the outside of my train shed. I have found a lot of 8" to 12" ones that sound kind of small to me. Does anyone know how large prototype railroad logos might have been, are any still available and what is a reasonable price if they are available? Also, does anyone make larger (18"-24") signs? I particularly want porcelain coated metal not just painted metal but may have to consider the less expensive depending on price.

If you go to ebay and put porcelain rairoad signs in the search box you’ll come up with some. I can’t tell if they are originals or reproductions, except for some that you’d think are original by the asking price. An example would be this LV example for a mere $3200 plus $150 shipping. If it were me, I’d go with the smaller, less expensive options, which would be large enough to get the point across without breaking the bank.

http://www.ebay.com/itm/RR-LEHIGH-VALLEY-RAILROAD-Porcelain-Piggyback-Super-Service-SIGN-Original-PA-/220940217893?pt=LH_DefaultDomain_0&hash=item3371102e25

You can try this site http://www.anderooney.com/

They appear to be down for maintenance tonight.

Well, it IS on sale right now! Looking at the photos, it looks like it might be a genuine Lehigh Valley item.