I don't know of anything similar, but I noticed last year that Gore seemed to be phasing out my favorite Oxygen shorts, so I emailed them to ask. They confirmed that the shorts were no longer being made, so I did a search and was able to find some online, from Competitive Cyclist I think. I bought three pairs. Maybe Sugoi could confirm if the RSE bibs are no longer being made, and if they plan to replace them with something similar?