It seems as if the Gold Mario are not as rare as once thought. The restock at Walmarts yesterday had a lot of people showing pictures with them sitting on the shelves/pegs still. Unfortunately I haven't had a chance to chase one down for anyone on here, but at least it means that 1) ebay prices will drop and 2) there's hope for those of you who still want to get one for our overseas members here.
Also, NOA tweeted yesterday that the Mario standalone amiibo (from the SMB series) will be available 4/3/15 for those who didn't want the "bundle".