How much do large Vinyl collections go for these days?

The discogs market is definitely broad, I think its depth depends on the genre. I've purchased and sold from/to international buyers many times. But the time between listing and selling depends a lot on what you're selling and how rare it is.

Whatever you do, good luck!

Depending on what you have and the condition you might be in for a surprise regarding the skyrocketing prices of certain Jazz records.First and second pressings are in high demand and there are a growing number of "sleeper" records that fall between the cracks that demand high figures.You got some very sketchy advice from the people here and this place is not the source you want to deal with determining the future and/or liquidation of your Jazz records.Another place you don't want anything to do with is a retail record store,you will get screwed for sure.
   Looking at DISCOGS is a good idea for a general ballpark price and i would direct you to JAZZCOLLECTOR.COM which is a site devoted to the tracking and discussion of the ebb and flow of Jazz records sold on Ebay and they have a alphabetical list of records and prices.I just hate to see people get boned on their record collections,unless of course,it is i who do the boning.Insert annoying snide smile icon here.
 Truth be told,you are a dolphin in the shark infested and highly competitive waters of the buying and selling of records.Most collections usually house a small percentage of truly valuable records,once you research them you might try selling these yourself on Ebay.Let the market determine the value.Good luck!!!!

The answer depends on the value of your time, and how much of FMV you want to receive.  If you want the LPs sold, as quickly as possible, then call dealers who will come to you, inspect your collection and make you a cash offer for everything.  Understand that you will receive a fraction of FMV....somewhere between 10-30% would be my guess.   If I were in your situation, I would segregate the most valuable records and sell them myself online.  Pre Liberty Blue Notes are worth more than you think right now, and it would not surprise me if many are worth more than $100 each.  Same for Prestige NY and NJ pressings.  Other labels not so much.   Discogs is a good resource for common and moderately valuable records.  It is difficult to navigate and there is a lot of incorrect and overlapping information in their segregation of pressings.  As an example, I have LPs listed on Discogs right now, and for some there are 3 specific description defaults for each LP !  Hard to determine which to use- so I list using all 3 and then delete as needed when one sells.   Time consuming.   You seem to be a knowledgeable collector, so you should not have difficulty in determining which pressings you have.   Jazzcollector and London Jazz collector are excellent web resources for investigation the minutia of LP pressing variations for Jazz labels.   When you have identified your pressings, you can then research FMV.   I would use a combination of Collectors Frenzy and Popsike to view recent sales.  You can search by artist, title, label, catalog number.   You can quickly view results and determine a value range for your pressing.   Anything worth more than $50 should be sold via Ebay.   You will have to take very clear pictures of the front/back covers, and record labels.  I have an iPhone 5se and the camera has sufficient resolution to create large images suitable for Ebay.  My experience is if I want FMV, I sell it on ebay.   I purchased a collection a few years ago.  I picked what I wanted then sold the rest.  Anything worth more than $25 was sold on Ebay, the rest at a local record fair at $5 each / 3 for $10.   I sold everything within 3 months of purchase and received more than I expected.  But it did take time and that is real question you have to answer for yourself.  How much time do you want to devote to the sale of your collection ?

Great discussion! Ties right in with my recent post!! Thanks folks.