We used Covid Consultants prior to a small family Christmas gathering and were very pleased. They send you the test kits, you overnight them back, and they email you the results within 24 hours of receiving your kits. Here’s a link to their FAQ about pre-travel testing: https://thecovidconsultants.com/faqs/

The cost is $220/person, but if the BVI accepts pooled testing you can do that for up to four people for $400.