A friend passed this on to me and I just stopped by the store to verify:
There is a seforim store called “Girsa” on Chafetz Chaim Street in Zichron Moshe that ships for $1.50 per kilo. You can pack it yourself otherwise they charge a bit extra to pack. They said out shipment every couple of weeks-call them at 02-500-1356 or stop by to find out when. You have a week from when it arrives to pick it up from the warehouse in Brooklyn.