I need two 11.2 X 24 Ag tires. Does everyone just buy locally or are there places on-line that you've found? Also, my local shop wants $70 each to mount a tire/tube, no calcium and I bring in the rims. Is that a reasonable number? I found Blem tires at Nebraska Tire for $75 each ($40 each shipping) but the mounting price seems high. Thanks, Dean