Brickpicker's database is full of historical eBay sold listings, but it's also important to find out what was just sold in the last 5 minutes. Click the link below to view eBay's latest sold listings. When you look at Brickpicker's data and see what sold today, it can help you to see if the sets you are interested in buying or selling are developing an upward or downward trend.
View the Latest Live eBay Completed Sold Listings
If you were able to pick this up for 50% off or better as an investment you'll do fine if you're patient.
If you were able to pick this up for 50% off or better for a personal build you're likely to be pleasantly suprised.