You can make your own, It's cheaper in accordiance to volume,it works better, and it attracts better, though Ive never used a trophy rock... I had a 8 pointer in my mineral site 3 hours after making it.

Ingredients:

2part Trace minerals
1part Dicalcium Phosphate
1part Rock Salt.

My results were unreal, Ive had over 1000 pics already this summer.