On sale at Thompson & Morgan, Pea Bingo is currently £1.99 for 100 seeds, a good deal to get a great collection of peas:

Pea Bingo - Pisum sativum
Hardy Annual
Dark green, semi leafless plant habit producing pods in pairs, averaging 8 dark green peas per pod. A heavy cropper even in poor growing conditions. Strong root rot tolerance and good powdery mildew resistance. Early maincrop maturity. Ideal for growing in containers. Height 80cm (32in).

Pea Bingo - Pea & Bean Seeds - Thompson & Morgan