I'm looking to buy almost all kegging supplies. Figured I would check here before buying brand new.
I have 2 corny pin lock kegs, so I still need most other supplies.
If you are planning to use all pin lock kegs you can check out Adventures in Homebrew (http://www.homebrewing.org/Set-of-Four-5-Gallon-Pin-Lock-Kegs-Used_p_3179.html). They stock refurb pin locks for $35. When I bought one of their four packs shipping was only $20 which made them a very good deal at $40 per keg. They have two store fronts in SE Michigan as well if you happen to be in that area to save on shipping. The kegs I got were in great condition with all new rings. I haven't had any issues yet and have had multiple beers through each.
I sourced a lot of my other stuff from Northernbrewer because they had a good deal if you spent over $200. They have a deal going right now that gets you $100 off a kettle if you spend over $200. Not sure if that is something you are interested in but buying kegging supplies is a great way to hit a price point like that to score a better deal.
Where are you located? I've got a 20# & 5# CO2 tanks. I'll only need one or the other. If you're close by I'll sell one to you, I'm in Kansas City, MO.