Microdata - prices and sale_prices for variant products
1) You need to submit a data feed to Google Merchant :
2) Have a Google Adwords account
3) Setup a shopping campaign
The price depends on your bidding, niche, competitor level, data feed quality, and many more factors. So is the price high is not really a question that can be answered.
You need to set aside a budget and come up with a return of investment plan.
Hope it helps.
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