My 2005 Accord's jack and lug nut wrench are missing. I was able to find a used one for sale in Nebraska but I was hoping for something a little closer to Oregon.

Am I correct to assume that I need a scissor jack that will support 1.5 tons (3000lbs) and a lug wrench with a 19mm opening? What I want is something that will fit in the space that Honda made for it. Other than that, I don't care if it is OEM or not.

Where should I go to buy an aftermarket jack?

 

Have you tried e-bay? Another option would be Car-part.com, and see if there are any close by. You could even try Craig's list, or posting a wanted add there.
I like the stock jack being compact like it is, and how it's stored. I've had other cars where I used to carry a small floor jack in, due to how crappy the OE one was. If truck space isn't a problem, Harbor Freight sells a nice little aluminum 1.5 ton floor jack that's pretty small. Then just get a socket set and 1 of their 20" breaker bars and you're all set. I use that combo when I go on road trips.