I've just this morning received a card from my local garden centre chain, The Garden Centre Group (used to be Wyevale) to say that all their flower and vegetable seeds are now half price. This is how I bought all my veg seeds last year and I have had no problems with germination at all as I believe they were all still in date when I planted them.
I may even have a few left over to use next year, and I will sow them as "back up", for example I always find salad leaves germinate well even when out of date and we do eat a lot of these in the warm weather. I try never to buy lettuce from the supermarket in the summer!
Happy frugal gardening!
2 hours ago