Today, my Walmart is selling the Mini-Metals line like you see in the Walthers catalog. Some can be used for H.O., but most are for larger & "N" scale.
I also found some of the Ertl, John Deere tractors that are small enough for H.O. The toy mgr. told me, "you" ain't seen noth'in yet!! I'll have to make sure I check the toy isle everyday at lunch instead every other day. The new modulars are being set in all the stores, so, you might have to wait till the shelves start filling up before we see any new items.
I also found some of the Athearn JD train sets at a lower price. Originally they were $75.00 & now, they are $59.00 in the closeout isle. There's quite a few left in my store because they put them in the wrong area, not in toys where I told them they would sell. I guess I don't know noth'in about trains & kids. LOL Big kids maybe.
Larry