They're £45 on eBay, but are tricky to grow: "Prunus dulcis (Common Almond) can be grown in southern Britain but as almond trees tend to flower very early in the year and are susceptible to frost damage, some form of protection will probably be necessary if you want your tree to bear nuts. Most almonds are self sterile and need to be cross-pollinated, so encourage bees to come into your garden (e.g. by companion planting) to ensure good pollination. Almonds need deep soil, a warm climate and adequate rainfall (16-40"/yr) and like peaches, they grow well against south-facing walls." from
NUTS