Scott,
The first thing you really need to do is create a inventory of the collection and do an assessment of the kit level of quality. Look at the listings here and on RC Groups or Ebay to get and idea of comparable values. You can post a list here and on RC Groups with prices and you will get interest. The work is keeping track of the offers and the time spent packing a kit up for shipping. It's time consuming so you have to consider what your time is worth. You can try the swap meet but most times, guys will keep their hands in their pockets and generally want something for next to nothing.
A second option is to contact a local professional auctioneer. There will be fees associated with the sale but the bottom line is the items are cleared out and gone. A sale like this is considered to be an absolute auction and you may not get what you think the value of a kit should be. You don't have to hassle with shipping and at the end of the sale, you walk away with a check.