I've never dealt with them before but $20 for a Normal is right, my only concern is the same as I stated before, they sell a lot more than just BP's and that always concerns me. Perhaps someone else will chime in that has bought from them before. My suggestion would be to contact any of the breeders who advertise here on BP.net as I'm sure they would have Normals for sale and you have a better chance of getter a healthier, well cared for animal.
BTW: forgot to say welcome to the forum and the addiction!