A sad but true FAQ, but I think it's officially too late, even for the 1.5. I've long argued that OLPC should sell the XO (2009: http://www.olpcnews.com/sales_talk/price/no_olpc_retail_sales.html , 2008: http://www.olpcnews.com/commentary/refocusing/xo_files_part_iv_new_olpc.... , http://joncamfield.com/blog/2008/03/rethinking_the_olpc.html ).
The fact is, the market it created has passed it by for many potential buyers who could have supported the XO ecosystem financially, if not through bug reporting and hacking.