I bought a rolling stand in 8/15 for $113.72 on Ebay. Works great. I added some additional padding to it for better protection. It came with a bag type cover.
The link looks to be the exact stand I have. Yes I could've built it myself, but for that price why?
https://www.ebay.com/itm/For-1997-2009-Porsche-Boxster-Hard-Top-Storage-Cart-22149WW-1998-1999-2000-2001/392416251732?hash=item5b5dd4cf54:g:miUAAOSw1klddCw p