ever hear of CafePress? They will print your shirt designs, but it is screen printing.
You may also want to look in the phone book for local Print Shops, but it won't be cheap, vastly decreasing your profit margin.
Airbrushing is a cheaper alternative to getting it printed, but you need a good compressor, and lots of Frisket Film.
My personal experience is that if you want it done to your exact specifications, do it by hand. Otherwise, screen printing is much easier. Airbrushing can be fun to get into, but once you outgrow your first cheap setup, the price gets pretty steep.
Blushed Sweater Top from Forever 21 --- it has the same silhouette, but different color/pattern: http://www.forever21.com/product.asp?cat...
Truly Madly Deeply Navajo Tunic from Urban Outfitters --- this one has the same pattern, but doesn't look as warm. haha: http://www.urbanoutfitters.com/urban/cat...
byCORPUS off the Shoulder Sweater from Urban Outfitters --- this one looks warm. ^^: http://www.urbanoutfitters.com/urban/cat...
Urban Renewal Off the Shoulder Graphic Sweatshirt --- they have this style in several other prints: http://www.urbanoutfitters.com/urban/catalog/productdetail.jsp?itemdescription=true&itemCount=80&startValue=81&selectedProductColor=&sortby=&id=18804864&parentid=W_APP_KNIT&sortProperties=+subCategoryPosition,+product.marketingPriority&navCount=1225&navAction=poppushpush&color=&pushId=W_APP_KNIT&popId=W_TOPS&prepushId=&selectedProductSize=&isSoldOut=
Cable Sweater Pullover from Free People --- really expensive xP: http://www.freepeople.com/clothes-sweaters/cable-sweater-pullover/
Hope this helps :)