Do you mean corrected for strength or just per pound????
I can look up list prices for you, which don't mean JackShi#.
The only other prices that I have are for light gage sheet and very large quantities.
316L 25ksi min yld base $1.10/# Feb Surch $1.32/# $2.42/#
2205 65ksi min yld base $1.85/# Feb surch $1.22/# $3.07/#
lean duplex (2101 or 2003)
lndx 65ksi min yld base $1.50/# Feb surch $0.82/# $2.32/#
These may not hold for your product form, but the ratios should.
Put another way, $/100ski equivalent
316L $9.68
2205 $4.72
lean duplex $3.57
If you are designing based on strength and 316 has enough corrosion resistance you need to look at the lean duplex alloys. Though enven 2205 would be cheaper today than 316L.
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Corrosion never sleeps, but it can be managed.