well thats a little vague... there are dozens of 6 pack (6 person max) charters... usually will run $100 to $140 per person ( usually an additional $20 to clear customs) w/ cocktails, lunch, snorkel equip. and instruction... there are a few larger sail boats that will take larger parties for close to the same fees, the one i would recommend is "Day Dreamer" 50ft + cat. roomy great stable boat.

We took a Limnos charter out of STT that was a blast. $220 for my wife and I to the Baths. The food was great and the drinks were flowing. We had a great time.

What about one that does not include booze?

How big is your group?

you may want to consider getting your own boat if you are 4 to 6.
5-6 would be a break even point
4 or less may add to cost.

The big question is what do you want to do Sail or See the BVI.
Yes there are some that do both. I have done daydreamer - great trip - not really sailing - had fun in JVD (just not long enough)

My recommendation is if you want to do the BVI and avoid booze cruise environment - look into renting a nauti nymph with a Capt.
If you want to sail - check into the boat TRUE LOVE - Sailing does not get any better. Built by Alden in the late 20s, and used in the movie True Love with Bing and Grace the boat can sail! But it says in US Waters.