Mobilman: I agree with the prior posters in that the vast majority of APS members don't submit fraudulent items knowingly and that for buyers, it is still "buyer beware." I don't do
ebay; it seems like too much hassle and my PayPal account doesn't function well. When I go on line, the APS store provides what I'm usually looking for. A nice find in in the past two years was two first flight covers from the late 1940s from Bissau in Portuguese Guinea; one to San Juan PR and the other to Trinidad.
Unfortunately, from one perspective, my primary area for collecting; I have several areas; is Portuguese Colonies. You can find dozens of dealers in Linn's and on line who sell primarily, or solely, US stamps. Portuguese, not as easy.