You can solve this issue by having accounts registered with several of the exchanges mentioned here. The larger exchanges with more volume traded will have a fairly stable price more accurately tied to the global average price. Smaller exchanges will have a wider range in price with not as many trades keeping it as closely linked to global price. Honestly it doesn't often get to far out of whack, maybe a few hundred dollars in variation.

Some people use that variation to attempt a quick turn around. Paypal and CC fees are high because they pay fees to utilize that funding option, and they come with more risk. Cutting down on fees is another benefit to multiple exchanges.

You can use low funding/trading fee exchanges for purchases, and the other exchanges for selling and withdrawing from.

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Offtopic, please refrain from multiposting you can copy the second post and paste it in as an edit to the first.

[Tips] Posting technique