Ok, so me and my fiancée have just started CFV and we have a starter deck each, but are wondering how best to move on from this. She has the flower maiden of purity deck and the two promos that came with it, I have the awakening of the inter dimensional dragon deck, didn't get any promos

Can anyone suggest a list of cards for each deck without spending more than around £10-£15 (for each deck) we can buy online to beef our decks up a bit, we aren't expecting to win any tournaments any time soon but if anyone can suggest some budget friendly cards we can pick up and edit our decks with that would be great.