I would of charged at least 3K+materials. Quoted an hourly rate plus pickup/delivery/haul off debris. If client wants to extend/add then I'm covered under the hourly rate.
I've had a few clients that were shell shocked upon receiving a final bill but I just point out all the extras they authorized me to do besides the original design they wanted. They still pay me.
Check Craigslist for a used tiller.
Stihl Kombi System
028 Super, 066 Chainsaws, PP 800 Pole Saw
F-150, F-350 Trucks
Ariens Rear Tine Tiller
5x12, 6x12, 6x14, 8x16, 7x18, 6x22
Asus Transformer Infinity TY700 Tablet
If you think it's expensive to hire a professional to do the job, wait until you hire an amateur.