I have (amongst other things) a Nespresso Dolce Gusto compact coffee pod machine but the pods are rather pricy for the Starbucks and official Dolce Gusto pods. One of the big supermarket chains has their own brand of real coffee and a limited range of Dolce Gusto flavours.
ALDI's Expressi range uses the K-Fee poD system, not compatible with anything else, these are very well priced. I have found a company that sells adapters to let K-Fee pods work in the Dolce Gusto device. Two such devices have been ordered. Amazon also sells the adapter but at 5 times the price of the others and they have to be imported as well.