We've been using CCB (mostly because we committed before their last price hike, ugh). Just for your records, CCB not only won't tell you anything beyond their minimum requirement *before* you order, they now have a new policy in which you can no longer ask them to send you the vials with the highest count from your donor, or even to send all vials for a single cycle from the same donation. So that's incredibly frustrating. This cycle I was able to put these things as a "request" on my order, and did get 3 vials from the same donation with nice high counts. So it worked out, but only despite the CCB system.
Joyful, busy, often overwhelmed queer academic mama to an awesome toddler and: