Well, for Audio House, you need to make sure you have read the terms & conditions small prints and for Courts or other major electronic department stores, be prepare to pay at the RRP (recommended Retailer Price) which is always higher than what other photo stores are offering.
The key here is do your research and know the current street price.
Go to the Price Guide section and look at the recommended stores. Send a few emails to get an eQuote before you step out of your house. Once you have received 2-3 quotes, you will have a better idea of the current street price.