You might try SMC winter stakes. They're the kind that have holes in them. I think they weigh like 0.9 oz each. Rei sells them. You can pound them in like a regular stake, or dig a trench for them in the snow and lay them in and then re-bury and pack down the snow over them so that they freeze in place.

Earlylite
http://sectionhiker.com
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Earlylite
http://sectionhiker.com