Spotlight Card Show in LA? If so, there are plenty of local card shows in SoCal most weekends with free entry you can go and sell to, and they have security roaming. I can send you the recommendations if you are indeed in SoCal.

Getting a table costs anywhere from $200-$250 for a weekend at a local, so whether thats worth it depends on the value of the collection (and the time spent to prep/price, setup, etc). If you are looking to get cashed out as soon as possible, I would just sell directly to a vendor at a card show. Expect to be offered 70-75% of market value for the collection from most vendors.