yes, stay away from the TopFlite props if possible. You can buy the NX/JXF/TBM/WildHare/BME (same prop, different logo) props at several places. I bought a couple from www.valleyviewrc.com , but Troy Built Models also sells them. My 22x8 is about $25 shipped. www.troybuiltmodels.com sells the 20x8 you are looking for, and the price is $19 plus shipping.

This price is about the same as the TopFlite prop, but trust me this TBM/JXF prop is significantly better. The blades don't flex and flatten out under load.