Mikey, apart from parsnips and some onions I rarely do my shopping on time,some things I only buy every two or three years, I usually buy in quantity so I can over sow if I am worried but they still work out very much cheaper. 1 pound of corn seed is little more than the price of 2 packets,lots to share and still be financially ahead. I only ever buy some things when they are on sale. I would never pay £6.99 for 5 cucumber seeds but with careful buying I have had them free for the last five years, this year I did buy a couple of packets, but 50% off. I tend to grocery shop the same way.
XX Jeannine