I've used Tayna before to supply batteries and it's worked fine and they've been quick and easy to deal with ..... one thing I'd check is the warranty given ....I recently bought some big Rolls renewable energy batteries .... 7 year warranty .... but when I checked Tayna as their prices are usually very good, they were only giving a 1 year warranty .... either they're buying them from Rolls without warranty and therefore cheaper .. or giving a 1 year warranty on something they're getting a 7 year warranty on from the manufacturer. I bought elsewhere slightly more expensive to get the full warranty in this case.
K
