I've used multiple vets including repro specialists, never got or heard of a 3 for 1 progesterone package, since it takes as many as it takes. Depending on the bitch and taking weekends/holidays into consideration because the blood is sent out and results are back next a.m. around here, I usually do the first draw around day 6-8. I pay around $70/test, usually end up doing 2-4 tests. If the stud owner is willing to have the bitch for a week instead of timing with progesterone, go for it. Slides = waste of money in my experience, especially when there is such an accurate alternative.
As far as the number of ties, up to the stud owner.