I would suggest Ebay.

You can usually find most any current scope made on ebay and a cool bonus is that you can find some past models sometimes new and still in the box.

I just took a quick look and there are Luepold, Thompson Center, Burris, Simmons, and Tasco Pro Class scopes all on there right now. All are Handgun models

Good thing about Luepold and Burris is they have lifetime warranties no matter if you were the first owner or not

"If you are going to go through all the trouble to put a hole in something, why not make it a big one?"