you can get seabands from most pharmacies, there are some that are velcro i heard they dont hold as well at the ones that are like wrist bands. they're about $15, and they do help. imnot sure about getting them on ebay, cos if they have been stretched they might not fit your wrists snuggly.
good luck. im so over being sick, just think what to eat for dinner makes me what to hurl!