Owning Gitzo equipment is like owning a luxury or sports car--parts are expensive. The best price I could find on a set of spikes was like $55, used. No.
It seems like most tripods out there have 3/8" threads at the bottom. Lots of accessories are only listed for specific tripod models, so you don't really know if they're 3/8" or not.
Shopping around B&H's used department, behold, the
Induro AWS-KIT for $4.99 plus shipping (
$28 plus shipping new). I purchased a 9+ condition kit but the listing has been live for the past few weeks...
For about $10, you get a nice pouch with a belt loop on the back and another loop on the side. A 10mm and 13mm dual-ended wrench plus 2 Allen keys are included.
Hope it helps someone!