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Poorfag crankbreaker anon here. Thanks a whole lot for the advice, anons.
I ended up getting a used replacement. Its an SRAM something-or-other. The guy said the chainrings only have around 30 miles on 'em, and they looked basically new. No scuffs or marks or anything.
I looked into it, and yes, my bottom bracket is GXP, so i'm not mismatching or anything.
LBS wanted $400 for the parts and labour originally, which is what i said fuck no to. Got the replacement for $20 and did the labour myself. Was an overall nice experience to be honest.