Annaquilts, I have been swapping dolls quilts from Australia mainly to the USA for over 2 years. It costs me around $15-$20 a month to send my little DQ from Australia to its new home. It usually takes about 10-14 days to get to its destination depending on the postal service (and public holidays, local delivery, etc) The postage does restrict me in what goodies I can include with my DQ but I feel the extras are an individual thing anyway and no swapper should be under pressure to include anything more than the DQ and a nice note.
The swap for me is all about meeting and getting to know quilters from around the world - the DQ I send/receive each month is just an added bonus