Chode, please be warned that StockXpert doesn't like too many 'similars'. They will accept some similars and duplicates so long as there are distinctions in the set, but if you try to upload your complete 'tape measure' series, for instance, they will almost certainly reject the whole lot.
In my experience the people at StockXpert are professional and accommodating but they are also strict on what they will and will not accept.