IMHO, don't rush out and buy a charger with an equalization mode. It is a "nice to have".
I'm thinking you will find that buying one will cost at least half of what you have in batteries.
There are other ways, old laptop power supplies etc.
But , if you don't have any of those, and can't do the equalization without buying a high priced charger, just get em all to a full charge with what you have.
You can use you're RE source down the road (hopefully) to do an equalization ( on a 2 month basis , or there abouts)