MicroMax LED 60x -100x Pocket Microscope - 6547937 | HSN Radio shack is where I found mine.. $15.00 Take a few tiny snips from deep on the plant where light doesn't reach inside and work on a table.. BNW
Any jewelers loupe on ebay or Amazon. I prefer 60x magnification. They're only a couple dollars and are all pretty much the same. Some come with small lights which can be handy. If there's a radio shack store or something similar nearby, they sometimes sell a pocket 60x-100x lighted pocket microscope that works well. There's several brands of those online also
I have one and it a pain to use. The little hand held one pictured above is perfect for the job and can be purchased online
I have a few and the one I use the most is this little thing... Ebay also sell them I have a USB one too and although it's great if I want to take photos, it's a bit of an ordeal if I just want to quickly check trichomes