I agree to avoid any mix with perennial rye ( not to be confused with winter/cereal rye which is a great cover crop for fall clover planting). As mentioned before, perennial rye is like lawn grass and can be very difficult to get rid of.
Luckily the local feed store in Alexandria, MN (the General Store) has a great selection and sells them in 1,5, and 50 pound bags depending on what you need.
I ordered a 25 pound bag of Alice White Clover for $125, and the inoculate for clover for $ $7.00 and had it shipped for $12 from Albert Lea seed. It already had an inoculant in the coating but I added fresh inoculant to be safe. It is supposed to be very winter hardy and drought tolerant. It was recommended by Paul Knox/dbltree and others. I will also frost seed some other white clover in the spring to get some diversity. ( something like a jumbo ladino along with some chickory).
I have used BOB in the past with good success, but planting clover in the fall with a cover crop is the way to go. You will have much less issues with weeds than with a spring planting.