Hey
Good budget friendly cycling padded shorts are available in Decathlon. If these are your first pair of shorts, would recommend you buying their mid-level shorts. It would be better if you could go to a store and check out the shorts and sizing in person. If not, then online is your second option.
Would suggest, checking out either of these two:
https://www.decathlon.in/p/8644185/shorts/men-s-bibless-cycling-shorts-rc100-black?id=8644185&type=p
Hope this helps!