I checked them out. $50.00 for a 4081 starter kit is a bit on the high side. It's not a terrible price, but there are cheaper kits out there.
TRUEMAN ECIG Passthrough Pcc DSE905 MOD VG Liquid adapter RN4081 M401 510 DSE801C DSE901C DSE084 DSE901 DSE801 DSE103 - sells them for $27.00, but you have to make a bulk order to make the postage charges pay off.