Valencia College does an online refresher course but you have to arrange for the clinical aspect yourself with a local hospital/preceptor. Cost is around 2 grand though. I was surprised as even without the refresher most places have been very good to offer long preceptorships/orientation to help me get back into the swing. Also check with your local nursing programs and see if they may be willing to let you attend a semester of the Med/surg clinical for non-credit. Some I know have gone this route and enjoyed it.
www.valenciaenterprises.org/health