The Varta and Bosch battery are made by the same company and identical apart from a label. I recently done some searching for a new battery for the Range Rover which also takes the 020 series 110Ah battery and these were the best deals I found.
I did buy the least expensive ebay battery at £96.50 which arrived at my door in less than 48 hours. I can highly recommend buying from that source
£109.85
here
£106
here
£96.50
here