Wow, that's a great and also terrible problem to have. The good news is that you probably have many thousands of dollars worth of discs, could easily be tens of thousands of dollars honestly. The bad news is that the only way to unlock all that value is a fair amount of hard work.
The fastest way to get rid of them would be to put them up for auction on eBay in lots (say lots of 10-20 discs each). However, without knowing what you're putting into the lots, you could easily create some lots worth thousands of dollars and some worth less than $100. Since not everyone has $2000 to spend on a lot of rare discs, your high value lots are most likely going to sell for way less than they're worth.
For discs worth a lot of money, you're going to get the most money listing them individually. For discs worth less, it's probably easier to sell in big lots as I said. In term of individual disc auctions, Facebook auctions will probably work better than eBay auctions since the big Facebook auction groups (like Dollar Disc Golf Auctions) get a lot of eyes on them. eBay is great if you already have some idea of the price of the disc because you can list stuff for a fixed price and just wait for someone who wants it to notice it. eBay is probably also fine for listing lots of discs that aren't worth a lot.
What you really need is a disc collector or two or three to go through the collection and sort them into 2 piles: "worth greater than $30" and "worth less than $30." Of course you could be more granular if you really wanted, but 2 piles is simple. Then you can auction off the valuable ones individually and the less valuable ones in larger lots. You could reward your helpers with a disc or two each for their time. Anyway, best of luck finding some (honest) helpers, and condolences on your loss.
