I use the $4.00 clippers you get at Wal*Mart for clipping nails on a cat. They are almost exactly like the expensive ones for lizards, just much cheaper.
Mainly, when you clip the nails, don't clip down where it's dark colored, just clip the light colored almost clear portion of the nail. Luckily, with beardies, if you do cut too much and get the quick, they do not bleed but a drop or two.
Unless your beardies get lots of exercise and on rough surfaces, you'll need to clip their nails. If you don't, it will cause their toes to curl and malform. Clipping toe nails is easier than cleaning scent glands...at least on my male 
Best of luck!
Bill
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1.0.0 Rottie/Malamute/Sheppard "Bear"
1.0.0 Pit Bull/Siberian Husky "Tonka"
0.1.0 Tabby "Cuddle Butt"
0.0.1 Brindled Rat Snake "Templeton"
0.0.1 Normal Ball Python "Monty"
1.1.0 Bearded Dragons "Odin" and "Hera"