The hoses are 1/4", and I think with -6 JIC (3/8") fittings. I think they're more like 2 - 3' in total length.
Probably in the $20 - $28 range.
Take the old hose with you so The Man can see which fittings are needed. There are several different hose termination fittings for each size of hose. You may have to change a fitting on the valve in order to have enough room. Hoses don't like sharp bends and there's not much room. Explain the situation to The Man and get his recommendation. Maybe take the one fitting off the valve with you as well.