I recently bought a 47" barbell on eBay and am pleased with it. The seller is efficient_fitness, or search on "Standard Regular Solid Bar 47" The price is 12.49 plus 9.99 shipping. One thing, though, I also ordered a pair of spring clips from the seller but wouldn't recommend them. They work, but the handles are short and quite hard to grip. The spring collars that I got for 2.99 a pair at Academy Sports work much better!
If there are no current auction for the 47" bar, you should be able to contact the seller to get them to relist it. To see the description if none are currently listed, list on completed items.
Carol