Shipping might be high & take longer, but is seems the prices of their attys make up for it.
VaporJunction(sorry cant post links yet) is the only other supplier I know that has EastMall attys, but they are 6.95 a piece, so 5 LR901s comes to $40 shipped.........$10 more than from EastMall.
And just looking real quick, NHaler's LR 901 attys(not EastMall) are $9 a piece, but maybe someone on here knows of a cheaper supplier.
EDIT: Just realized EastMall has $35 minimum to ship, so VaporJunction seems like your best bet, unless someone knows where to get them cheaper.