Tractor Supply has three differant models of dozer by norscot ( HO Scale) for $5.99 a piece. That is alot cheaper than Ebay.
Northern tool also has HO Caterpillar machinery and some tractor trailers last time I was there.
Tractor supply now has them for $4.32 a piece.
Nope never saw those but I will check them out. Thanks for the info.