Finishing a campaign

We have been running a campaign in person and have only 1 or 2 more sessions left. We are doing lost mine of phandelver and are looking for some recommendations on how to finish it online.

Hi Dennis.  I think buying LMoP would be an easy solution.  You could likely jump in and finish it up from what you get with the purchase.  Some characters may not be able to completely re-create their characters easily as not purchasing  other source books would make some things need to be input manually on their character sheets.  Roll20 is totally usable without purchases, but in most cases, purchases = ease of use and time savers.