Oooh, another good source! Thanks, Polly! Their minimums are similar to van Engelen in general (100 tulips, 50 daffs or 50 hyacinths of a variety)... and I've mostly been buying bulbs in sets of 50+ for a few years now.
Van Engelen is the source I was going to suggest, and if you haven't ordered yet it might be worth comparing prices and varieties. I just "registered" with ADR, so I haven't confirmed etc. and been able to check their price list yet.
Hyacinths are wonderful in large plantings... sweeps & swaths of color!