The Bank Booster +50 is a unique service available from Solomon's General Store that permanently increases maximum bank space by 50. From 3 September 2013 onwards, it was made available for 208,800 loyalty points. On 22 October 2013 the price was lowered to 146,160 loyalty points. They were announced for RuneCoins only on 29 March 2016, starting from 3 May. It was the first purchase from Solomon's Store to provide a service. Players may purchase a maximum of ten Bank Boosters and collect four free Bank Booster, accumulating to a total possible 700 extra bank slots. Free players may use the extra space obtained for free-to-play items only.
The Bank Boosters were said to be coming to the Loyalty Shop in the next couple weeks after initial release. Mod Mark announced in a December Reddit AMA that the actual release date would be sometime in 2013.
To buy all bank boosters as a member, it would cost approximately $85 (USD) in Runecoins, or 17 cents per additional bank slot. You can now also buy Runecoins with bonds. Each bank booster would cost 3 bonds for a F2P, at an exchange rate of 195 Runecoins per bond.
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