i deal with Heritage often. They do have a wide amount of lots. Pre-war and Post-war.
That be my best suggestion. But if you do notice...PWCC has been getting top bids on their items as well. Shilling or what not..its the talk on the board.
here is a link, of auction house schedules, whats open and when:
http://www.auctionreport.com/sirius-...tion-ends-321/