A Dialogue about Conditionals and New Technologies

Fill in all the gaps with the correct conditional tense, then press "Check" to check your answers.

YOU: I need a good digital camera to take pictures urgently. My friend told me that SONY 550 is a good one. It has 7.1 megapixels and a 3.1 optical zoom.
SHOP ASSISTANT: We don’t have any right now but if you (be) in such a hurry, it (be) difficult to find that model in a small shop like this, you should go to a specialized shop. Why don’t you go to the new technology shop in the shopping centre in the next town?
YOU: Well, I don´t know because If I (go) to a specialized shop, the camera (be) more expensive and I (have) to save more money.
SHOP ASSISTANT: If I (be) you and I (not have) enough money, I (go) to the auctions on the internet. Some people say it is cheaper.
YOU: How can I buy a camera there?
SHOP ASSISTANT: If I (know) how, I (tell) you, but unfortunately I don´t,
YOU: Thanks anyway. What a pity! If I (know) digital cameras are better to buy in the internet, I (not waste) my time coming to the centre of town.