Not the same -- nylon woven netting. It'll have very little insulation and wind blocking value.
If you want good prices on roles of this stuff, you have to go to agricultural vendors.
Here is 6' by 250' for $30 -- I think this is the same fabric weight as those plant bags:
http://www.agriculturesolutions.com/...6-x-250-detail
They also have heavier weights. I think at least 1.5 oz would be what's needed to make it durable enough if you're putting the time in to sow it.
Translates to about $0.25 per yard (of 5' wide fabric) through that vendor.
http://www.agriculturesolutions.com/...2-x-250-detail
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