how to get premiership soccer tickets?

[mosta]

I think I'm going to be in London over new year's for the first time, and I'm planning the trip around trying to catch two permiership matches. I'd like to see Chelsea and Arsenal if at all possible, but will take the best I can get if not. anyway, I've seen some brokers listing online who offer such tickets. however, when I look on official club websites, it seems like tickets that far ahead aren't even on the market yet.

anyone have any insight into what I should expect? approx prices? online brokers, or scalpers at game time? thanks.