I found these on eBay and they might be a good deal for someone looking for a robust 600VA combination isolation and step up/down transformer. eBay has enough pictures of the outside, so I just posted one of the inside here--since I tore it apart before turning on, as per the motto. It's all C13/C14 connectors so you need little adapter cords, but those are typically available and make it handy for worldwide use. I bought one for a 240VAC bench source and one for a long-term travel power adapter, but it might be a bit big for that. You get 230/115 selection on both input and output. I tested it for leakage, it has ~40uA so not medical or metrology grade but adequate for most purposes. I didn't test load regulation yet, but it has a pretty large toroid so probably pretty good. It looks really solid and well made--there are literally just too many screws holding the thick stamped aluminum chassis together. I'm not in any way associated with the seller, but everything was very good including double-boxed packaging.
https://www.ebay.com/itm/134092407056