Purchasing new house with pond. Would love to own and use a Sickle-Mo to trim the bank, and keep the pasture mowed. Anyone selling?

I have an Ariens Sierra 1640H lawn tractor with the grass catcher. I need the tube and upper boot but retail list prices are way too high, over $100 each. They are part numbers 03610700 for the boot and 03618000 for the tube. Does anyone have these used at a fair price or can anyone help me with...