Just went to Pull-A-Part today. Before I did though, I printed out a list of the Elantras and Sonatas that they had in stock. These include the rows they are found in.
My wife and I made it a Valentines Day date, she actually likes going there. We found quite a few choices in the 15" diameter that is used on my 17 Eco model. Looked and looked for a tire jack and as we were leaving, I asked why they were all gone from the vehicles? The clerk pointed to the other side of the aisle we were in. Lo and behold, piles of jacks with labels as to what model they belong to. I found what looked like a brand new Elantra jack and purchased it. So, in total it was about $20 and our time spent for a compact spare and jack. Oh, I also got some of the pkging, that usually holds the spares in place. I'll have to do a little modification to it, but it should work out just fine.
Good Luck and God Bless!