I am finishing my homemade Dobson. I need a 10" mirror with a focal length of F/4 to F/6. I am also looking to buy a 2" secondary and a low-profile focuser. I would prefer mirrors with decent coatings and no chips, but I would consider a compromised setup if the price is right. I live in Tucson, AZ, and I'm willing to pay for the appropriate shipping charges from anywhere in the continental US.