A bit of news, folks: My Forsaken Lands (Swamp Caves / Desert Sanctum) poster map is now listed along with my other poster and cards at Paizo's online store, so if you're planning other gaming product purchases, it's a great way to get everything at once!
http://paizo.com/store/byCompany/m/mapsOfMasteryIf you're just buying the maps, I still recommend using my website store (I recover my investment in the printing twice as fast that way, and the shipping is cheaper), but Paizo's got a lot to offer as well. Check it out!