Today I bought an apple tree from Aldi. It is an Elstar, an offspring of the Golden Delicious. I bought this cultivar before and it died. However the original cost £25.99 and this one only cost £3.99 so there is not so much to risk.
(Elstar is a crunchy apple. The flesh is lemon-white. In most Golden Delicious offspring it is the other parent which provides the essential counter-balance to offset the sweet blandness of Golden Delicious. In the case of Elstar this is Ingrid Marie, a variety which originates from Denmark. Although not a widely-known apple, it lends a bit of sharpness to the mix – inherited from its own parent, Cox’s Orange Pippin. The result is Elstar, which is probably one of the best Golden Delicious offspring)

