robinshe,
Tricky question because foreign sales of crafts -to- the US is difficult to measure. What is available is a profile of craft industry in the US, which at least offers a view of the landscape onto which you are stepping. Take a look at this breakdown of the crafts industry in the US - http://www.codacraft.org/dnn/CodaSurvey/NationalSummary/tabid/117/Default.aspx
An example of the info this offers - you'll quickly see that glass and metal crafts dominate sales. Obviously a startup would want to consider this if breaking into the US market.
Note this is internal figures only - it does not show the value of sales to the US by a foreign source. (It's a huge market, by the way.)
Hope that helps.
Edit: Here's a report from 2003 that does show imports by country of cultural goods. http://www.uis.unesco.org/template/pdf/cscl/IntlFlows_EN.pdf See especially pages 15-27. US was importing in excess of $1Bn per year at that time.