That is a nice price, thanks for sharing the information.
And I know that you are looking at springs, but I have found it best to have the valves in hand when the head seat work is done, then get the retainers and measure the installed height (valve closed) and from that subtract the lift at the valve and get the valve open spring height then go valve spring shopping to get the seat pressures that match up with cam.
To fine tune it you can get keepers with off set groves that move the retainer about .020
