I just bought one at Macy's from the "Last Call" rack. That won't stop me from looking for an alternative between now and then.
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I've gone about 10 years running. The first few time I went, I kind of packed everything had I had, which wasn't very much. I met someone up there (from the local area) the first time I went. She was a much more efficient packer than me, and taught me to pack only 2 outfits per day, one for the daytime and one for the evening. That's what I've been doing and it works out quite well. The main problem is that I have to quarantine a room to try on outfits to make sure that they fit and match well enough.
Don't forget that you can also fly. This year, there were about 800 girls there. TSA couldn't have been too surprised seeing the 50th trans girl go through security on the way home.