Am I paying too much for my gum grafts?

I got 3 frenectomies removed within the last 4 months and 1 gum graft was done 5 days ago. I paid $150 for each frenectomy; $1080 for the 1 gum graft procedure and $485 for the tissue my dentist bought from the lab as I refused to have him cut my tissue from my mouth (screw that idea!). I think I was overcharged as a co-worker of mine had 7 grafts done for only $2000 (she did it in the States though, and she used her own tissue for the grafts). Hope that helps.