Hello,
Editing the corresponding products to set the price is usually the best solution.
You can see to use a mass-action if you want to perform an action on a bunch of elements (please test your mass-action in a test website before).
Otherwise, you can see to use a discount but, it is not a good solution for the long term.
Regards,
Jerome - Obsidev.com
HikaMarket & HikaSerial developer / HikaShop core dev team.
Also helping the HikaShop support team when having some time or couldn't sleep.
By the way, do not send me private message, use the "contact us" form instead.