Binders are great for that, I say go for it! I think it might of been an error and there are 400 but I read 600 somewhere for sure but now the same place says 400, so.. confusing!
Either way it will still be very hard OTL;; I'm going to try and save aside a little extra cash here and there and try to get a box each month/ every 2 months to make it seem more achievable.
I hope yours come soon, I made the mistake of ordering from YesAsia to avoid customs but from there it usually takes 6 weeks for stuff to get to my house from HK >__<;;
Anyway, I hope you get good ones and not many doubles!