Marc's right. it will be significantly more expensive if you do find it in a shop. For example, the last s/w I bought online, from the US cost literally half the best price I managed to source it from a UK vendor. Saved me a couple of hundred UKPs. I suspect your best bet, if your parents are worried about credit card fraud and the likes is to find a good friend to make the purchase for you and you transfer them the funds. But do NOT take this as an offer
I've made literally hundreds of online transactions and so far not even been close to a sniff of any wrong doing.