I just received a quote from a flower vendor. For the bridal bouquet, it would be lavender roses in a holder thing. $150. Example:

For the two bridesmaids' bouquets, they would be in a bouquet holder and more of a mix of roses, lavender stock, shades of purple hydrangea, and perhaps a lavender
lisianthus. $90 each, $180 for both. Example (but without the lilac):

For the two groomsmen's boutonnieres a single lavender rose. $6.95, $13.90 for both
For the groom's boutonniere, one lavender rose with a little something more (not sure what yet). $13.95
Sub-total: $357.85
Total with tax: $404.37