Thanks very much poohbear and williep. Great help indeed. I did not buy them yesterday. The petshop had only 2 pairs, and he said they are from the same supplier but definitely not related since the suppliers gives them right pairs and he takes care of them. I dont know if I can believe him.
This petshop owner seems to be least bothered about me, I thinks thats because he sells huge red african parrot pairs, dont know the exact name, for prices he says, 7 lakhs rupees

(something around US$14000). Im CERTAINLY a tiny customer

for buying gouldians at Rupees 2500 (US$50) a pair. He seems to have a good shop with dozens of varieties of birds.
OK, about the goulds he had, there was a small male with beautiful colour and finish. Legs were ok, better than the other ones, but all had slight white layers on the legs.Male had a red tipped beak, red head, purple breast, yellow underbody, green back. Female was a black head, green back, purple breast and yellow underbody - and yes, a grey/reddish tipped beak. Female also looked healthy and a little fat comapred to others. But the female was quite LARGER than the male.
One thing that put me down from buying this pair yesterday is that the male and female had slight grey feathers (not much, about 10% os its wing leading edges). Is it that they are finishing moulting? Or they are becoming adults from juviniles? Or are they not goood pairs and it was not a proper breed of gouldians? The grey feeathers in the female were more in numbers than the male (male only had a few feathers like that).
So,

can I buy the male from the shop now and buy a female later? Is this ok? This may also ensure that I get a birds from different families
By what he said, he may not be having them for long since many people buy from him. If you help me out, i can go today and buy either the male or the pair. He says, the next batch of goulds he may get is only in March.
Help is greatly needed, since this is a large amount of money for me at this time of the year, and I want to make justice spending it.
Thanks to your replies in advance.