When I made a quilt, I bought climashield xp from the US (a few years ago - before Apex)
- it only took 10 days to arrive
But, if you go for Extremetextiles, I believe that Primaloft sport is more suitable for DIY - needs less quilting than PL1.
FYI I used 5oz XP and in the UK, wouldn't expect to use it below 4 degrees - even in a tent. It's just not warm enough for me for other than 2 season use. That would be with clothing worn aswell.