I have an AP so no tickets but when I get tickets for my son he either gets them through the military with their discount if available or I get them through parksavers with their discount.
I shop around for the resort, if there is a general discount out I'll check Orbitz and Cheaptickets to see if they are offering a % off deal and if they have any of the general discounts available to stack on. If there is an AP discount for the time I want to go I'll compare it to the other deals and book the one that is better. I've been known to book something and keep checking and change it, I've already changed my upcoming Sept. trip 3 times and will continue to look for deals until the date I can't cancel without a penalty. I did rent DVC points once through David's but since I don't normally know I'm taking a trip until 3 months out at the earliest it's hard to find anything with them. That trip was my first split stay between POR and OKW on points and got me hooked on split stays. I do them every trip now. I've check with David's a few times for other trips but there wasn't anything I wanted since I only need a studio and like the Epcot resorts which are harder to get.
I don't book ADRs in advance, we tend to fly by the seat of our pant and just book them on the fly but if there is one I really want (GF tea I'm looking a you) I'll just book it myself on WDW's site.